AGREEMENT AND PLAN OF MERGER

                                        DATED

                                   OCTOBER 12, 1997

                                        AMONG

                               ICG COMMUNICATIONS, INC.

                                         AND

                     NETCOM ON-LINE COMMUNICATION SERVICES, INC.


          


                                  TABLE OF CONTENTS

                                                                       Page
                                                                       ----

                                      ARTICLE I

                                     DEFINITIONS

          Section 1.1    Definitions  . . . . . . . . . . . . . . . . . . 1
          Section 1.2    Other Definitions  . . . . . . . . . . . . . . . 3
          Section 1.3    Use of Terms . . . . . . . . . . . . . . . . . . 5

                                      ARTICLE II

                            THE MERGER AND RELATED MATTERS

          Section 2.1    The Merger . . . . . . . . . . . . . . . . . . . 5
          Section 2.2    Effective Time of the Merger . . . . . . . . . . 6

                                     ARTICLE III

                             CONVERSION OF CAPITAL STOCK

          Section 3.1    Conversion of Stock  . . . . . . . . . . . . . . 6
          Section 3.2    Exchange of Certificates . . . . . . . . . . . . 7
          Section 3.3    Dividends and Other Distributions. . . . . . . . 9
          Section 3.4    No Fractional Shares.  . . . . . . . . . . . . . 9
          Section 3.5    No Liability . . . . . . . . . . . . . . . . .  10
          Section 3.6    Lost Certificates  . . . . . . . . . . . . . .  10
          Section 3.7    Treatment of Stock Options, Etc. . . . . . . .  10
          Section 3.8    Closing of the Company's Transfer Books  . . .  11
          Section 3.9    Closing  . . . . . . . . . . . . . . . . . . .  11
          Section 3.10   No Repurchase Rights . . . . . . . . . . . . .  11

                                      ARTICLE IV

                        REPRESENTATIONS AND WARRANTIES OF ICG

          Section 4.1    Organization and Qualification . . . . . . . .  11
          Section 4.2    Capitalization . . . . . . . . . . . . . . . .  11
          Section 4.3    Subsidiaries . . . . . . . . . . . . . . . . .  12
          Section 4.4    Authority Relative to this Agreement . . . . .  12
          Section 4.5    No Breach; Required Consents . . . . . . . . .  13
          Section 4.6    Consents and Approvals . . . . . . . . . . . .  13
          Section 4.7    Reports and Financial Statements . . . . . . .  13
          Section 4.8    Compliance with Law; Litigation  . . . . . . .  15
          Section 4.9    Title to Assets  . . . . . . . . . . . . . . .  15
          Section 4.10   Employee Matters . . . . . . . . . . . . . . .  15
          Section 4.11   ERISA  . . . . . . . . . . . . . . . . . . . .  16
          Section 4.12   Operations of Acquisition Sub  . . . . . . . .  17
          Section 4.13   No Broker  . . . . . . . . . . . . . . . . . .  17
          Section 4.14   Taxes  . . . . . . . . . . . . . . . . . . . .  17
          Section 4.15   Environmental Laws . . . . . . . . . . . . . .  17
          Section 4.16   Transactions with Affiliates . . . . . . . . .  18
          Section 4.17   Approval . . . . . . . . . . . . . . . . . . .  18

                                      ARTICLE V

                    REPRESENTATIONS AND WARRANTIES OF THE COMPANY

          Section 5.1    Organization and Qualification . . . . . . . .  19
          Section 5.2    Capitalization . . . . . . . . . . . . . . . .  19
          Section 5.3    Subsidiaries . . . . . . . . . . . . . . . . .  19
          Section 5.4    Authority Relative to this Agreement . . . . .  20
          Section 5.5    No Breach; Required Consents . . . . . . . . .  20
          Section 5.6    Consents and Approvals . . . . . . . . . . . .  21
          Section 5.7    Reports and Financial Statements . . . . . . .  21
          Section 5.8    Compliance with Law; Litigation  . . . . . . .  22
          Section 5.9    Title to Assets  . . . . . . . . . . . . . . .  23
          Section 5.10   Employee Matters . . . . . . . . . . . . . . .  23
          Section 5.11   ERISA  . . . . . . . . . . . . . . . . . . . .  23
          Section 5.12   Approval . . . . . . . . . . . . . . . . . . .  24
          Section 5.13   Financial Advisor  . . . . . . . . . . . . . .  25
          Section 5.14   Taxes  . . . . . . . . . . . . . . . . . . . .  25
          Section 5.15   Environmental Laws . . . . . . . . . . . . . .  25
          Section 5.16   Transactions with Affiliates . . . . . . . . .  25
          Section 5.17.  Contracts  . . . . . . . . . . . . . . . . . .  26
          Section 5.18.  Intellectual Property  . . . . . . . . . . . .  26

                                      ARTICLE VI

                        CONDUCT OF BUSINESS PENDING THE MERGER

          Section 6.1    Conduct of Business of the Company . . . . . .  26
          Section 6.2    Conduct of Business of ICG . . . . . . . . . .  29

                                     ARTICLE VII

                                ADDITIONAL AGREEMENTS

          Section 7.1    Access and Information . . . . . . . . . . . .  30
          Section 7.2    SEC Filings  . . . . . . . . . . . . . . . . .  31
          Section 7.3    Meetings of Stockholders . . . . . . . . . . .  34
          Section 7.4    Compliance with the Securities Act . . . . . .  34
          Section 7.5    Reasonable Best Efforts  . . . . . . . . . . .  34
          Section 7.6    Confidentiality and Public Announcements . . .  35
          Section 7.7    Notification . . . . . . . . . . . . . . . . .  35
          Section 7.8    HSR Act Filings  . . . . . . . . . . . . . . .  35
          Section 7.9    Indemnification of Executives  . . . . . . . .  36
          Section 7.10   Employee Benefits  . . . . . . . . . . . . . .  37

                                     ARTICLE VIII

                                 CONDITIONS PRECEDENT

          Section 8.1    Conditions to Each Party's Obligation
                         to Effect the Merger . . . . . . . . . . . . .  37
          Section 8.2    Conditions to Obligation of the Company
                         to Effect the Merger . . . . . . . . . . . . .  38
          Section 8.3    Conditions to Obligations of ICG and
                         Acquisition Sub to Effect the Merger . . . . .  39

                                      ARTICLE IX

                          TERMINATION, AMENDMENT AND WAIVER

          Section 9.1    Termination  . . . . . . . . . . . . . . . . .  39
          Section 9.2    Remedies.  . . . . . . . . . . . . . . . . . .  40
          Section 9.3    Amendment  . . . . . . . . . . . . . . . . . .  41
          Section 9.4    Waiver . . . . . . . . . . . . . . . . . . . .  41

                                      ARTICLE X

                           GENERAL PROVISIONS; DEFINITIONS

          Section 10.1   Non-Survival of Representations, Warranties
                         and Agreements . . . . . . . . . . . . . . . .  42
          Section 10.2   Notices  . . . . . . . . . . . . . . . . . . .  42
          Section 10.3   Fees and Expenses  . . . . . . . . . . . . . .  43
          Section 10.4   Specific Performance . . . . . . . . . . . . .  43
          Section 10.5   Third Party Beneficiaries  . . . . . . . . . .  43
          Section 10.6   Entire Agreement; Miscellaneous  . . . . . . .  43
          Section 10.7   Governing Law and Venue; Waiver of Jury Trial   43


          


                       EXHIBITS
                       --------

          EXHIBIT                  DESCRIPTION
          -------                  -----------

          A                        Form of Affiliate Agreement


          



                             AGREEMENT AND PLAN OF MERGER


                    THIS AGREEMENT AND PLAN OF MERGER (this "Agreement") is
          dated October 12, 1997 and is entered into by and among ICG
          Communications, Inc., a Delaware corporation ("ICG"), and NETCOM
          On-Line Communication Services, Inc., a Delaware corporation (the
          "Company").

                                       RECITALS
                                       --------

                    A.   ICG and the Company have agreed to enter into a
          transaction in which a Delaware subsidiary of ICG to be formed
          ("Acquisition Sub") will merge with and into the Company  (the
          "Merger").  At the effective time of the Merger, the outstanding
          shares of the capital stock of the Company shall be converted
          into the right to receive shares of common stock of ICG (except
          as provided herein).  As a result, ICG will become the holder of
          all the outstanding shares of capital stock of the Company and
          the holders of shares of capital stock of the Company outstanding
          immediately prior to the Merger will become holders of shares of
          common stock of ICG.

                    B.   The Boards of Directors of ICG and the Company
          each have determined that the transactions described herein are
          in the best interests of their respective corporations and
          stockholders.

                    C.   It is intended that, for federal income tax
          purposes, the Merger shall qualify as a reorganization under the
          provisions of Section 368(a) of the Code.


                    D.   For financial accounting purposes, it is intended
          that the Merger shall be accounted for as a "pooling-of-
          interests" under generally accepted accounting principles.

                    NOW, THEREFORE, in consideration of the foregoing
          premises and the representations, warranties and agreements
          contained in this Agreement, the parties to this Agreement agree
          as follows:

                                      ARTICLE I
                                      ---------
                                     DEFINITIONS

                    Section 1.1    Definitions.  As used in this Agreement,
                                   -----------
          the following terms with initial capital letters will have the
          meanings set forth below:

                    "Affiliate" means, as to any Person, any other Person
          which, directly or indirectly, controls, is under common control
          with, or is controlled by, such Person.  As used in this
          definition, "control" (including, with correlative meaning,
          "controlling," "controlled by" and "under common control with")
          means possession, directly or indirectly, of the power to direct
          or cause the direction of the management and policies of a Person
          (whether through the ownership of voting securities, by contract
          or otherwise).

                    "Business Day" means any day on which commercial banks
          are open for business in Denver, Colorado and San Jose,
          California.

                    "Company Common Stock" means the shares of common
          stock, par value $.01 per share, of the Company.

                    "Code" means the Internal Revenue Code of 1986, as
          amended.

                    "Environmental Law" means any applicable Legal
          Requirement relating to the protection, preservation or
          restoration of the environment (including, air, water vapor,
          surface water, ground water, drinking water supply, surface land,
          subsurface land, plant and animal life or any other natural
          resource).

                    "Equity Affiliate" means, as to any Person, any other
          Person in which such Person or any of its Subsidiaries holds a
          five percent or greater equity interest.

                    "ERISA" means the Employee Retirement Income Security
          Act of 1974, as amended.

                    "ERISA Affiliate" means, as to any Person, any trade or
          business (whether or not incorporated) that is treated as a
          single employer with such Person under Section 414(b), (c), (m)
          or (o) or the Code.

                    "GAAP" means generally accepted accounting principles
          as in effect from time to time in the United States of America.

                    "ICG Closing Stock Price" means the average of the
          Volume Weighted Average Price of ICG Common Stock, as quoted by
          NASDAQ, for the ten consecutive trading days ending two trading
          days prior to the Closing Date.

                    "ICG Common Stock" means the shares of common stock,
          par value $.01 per share, of ICG.

                    "Intellectual Property" means copyrights, patents,
          trademarks, service marks, service names, trade names,
          applications therefor, technology rights and licenses, computer
          software (including any source or object codes therefor or
          documentation relating thereto), trade secrets, franchises, know-
          how, inventions, and other intellectual property rights.

                    "Knowledge" means the actual present knowledge of a 
          Person that is a human being and, in the case of a Person that is
          not a human being, the present actual knowledge of any executive
          officer (or any human being having duties comparable to those of
          an executive officer) of such Person.

                    "Legal Requirement" means any statute, ordinance, code,
          law, rule, regulation, order or other requirement, standard or
          procedure enacted, adopted or applied by any Governmental Entity,
          including judicial decisions applying common law or interpreting
          any other Legal Requirement or any agreement entered into with a
          Governmental Entity in resolution of a dispute or otherwise.

                    "Lien" means any lien, security interest, pledge,
          charge, claim, option, right to acquire, restriction on transfer,
          voting restriction or encumbrance of any nature.

                    "Material Adverse Effect" means a material adverse
          effect on the business, properties, assets, prospects, condition
          (financial or otherwise), liabilities or operations of a Person
          and its Subsidiaries, taken as a whole, or on the ability of such
          Person to perform its obligations under this Agreement.

                    "NASDAQ" means the over-the-counter market of the
          National Association of Securities Dealers, Inc.

                    "Person" means any human being or any partnership,
          limited liability company, corporation, business trust, joint
          stock company, trust, unincorporated association, joint venture,
          Governmental Entity or other entity.

                    "SEC" means the United States Securities and Exchange
          Commission.

                    "Subsidiary" means, with respect to any Person, any
          other Person more than 50% of whose outstanding voting securities
          or partnership or other equity interests, as the case may be, are
          directly or indirectly owned by such Person.

                    "Termination Fee" means cash in the amount of
          $11,340,000.

                    Section 1.2    Other Definitions.  The following terms
                                   -----------------
          are defined in the Sections indicated:

                         Term                             Section
                         ----                             -------

                         Acquisition Proposal             6.1(h) 
                         Acquisition Sub                  Recital A
                         Agreement                        Preamble
                         Antitrust Division               7.8
                         BT Alex. Brown                   5.4
                         Certificate of Incorporation     2.1(a)
                         Certificate of Merger            2.2
                         Closing                          3.9
                         Closing Date                     3.9
                         Company                          Preamble
                         Company Benefit Plans            5.11(a)
                         Company Options                  3.7
                         Company Permits                  5.8(a)
                         Company SEC Reports              5.7(a)
                         Company Stock                    3.1(b)
                         Company Stock Certificates       3.2(a)
                         DGCL                             2.1
                         Effective Time                   2.2
                         Exchange Act                     4.6
                         Exchange Agent                   3.2(a)
                         Exchange Ratio                   3.1(a) 
                         Executive                        7.9(a)
                         FTC                              7.8
                         Governmental Entity              4.8(a)
                         HSR Act                          4.6
                         ICG                              Preamble
                         ICG Benefit Plans                4.11(a)
                         ICG Certificates                 3.2(a)
                         ICG Permits                      4.8(a)
                         ICG SEC Reports                  4.7(a)
                         Indemnified Party                7.2(h)(iii)
                         Indemnifying Party               7.2(h)(iii)
                         Joint Proxy Statement/
                              Prospectus                  7.2(a)
                         Losses                           7.2(h)(i)
                         Meeting                          7.3
                         Merger                           Recital A
                         Most Recent Company
                              Balance Sheet               5.7(c)
                         Most Recent ICG Balance Sheet    4.7(c)     
                         NASD                             7.3
                         Other Filings                    7.2(b)
                         Preliminary Joint Proxy
                              Statement/Prospectus        7.2(a)
                         Secretary                        2.2
                         SEC Filings                      7.2(c)
                         Securities Act                   4.6
                         Surviving Corporation            2.1
                         Tax                              4.14


                    Section 1.3    Use of Terms.  Terms used with initial 
                                   ------------
          capital letters will have the meanings specified, applicable to
          both singular and plural forms, for all purposes of this
          Agreement.  All pronouns (and any variations) will be deemed to
          refer to the masculine, feminine or neuter, as the identity of
          the Person may require.  The singular or plural includes the
          other, as the context requires or permits.  The word include (and
          any variation) is used in an illustrative sense rather than a
          limiting sense.  The word day means a calendar day.  All   
          accounting terms not otherwise defined in this Agreement will
          have the meanings ascribed to them under GAAP.


                                      ARTICLE II
                                      ----------

                            THE MERGER AND RELATED MATTERS

                    Section 2.1    The Merger.  Subject to the terms and 
                                   ----------
          conditions of this Agreement and applicable provisions of the
          Delaware General Corporation Law ("DGCL"), at the Effective Time: 
          (i) Acquisition Sub will be merged with and into the Company;
          (ii) the separate existence of Acquisition Sub will cease and the
          Company will continue as the surviving corporation in the Merger
          (the "Surviving Corporation"); and (iii) the name of the
          Surviving Corporation will be NETCOM On-Line Communication
          Services, Inc.  From and after the Effective Time, and without
          any further action on the part of any Person, the Merger will
          have all the effects provided by applicable Legal Requirements,
          including Sections 251 and 259 of the DGCL, the effects described
          in Section 3.1 with respect to the capital stock of
          Acquisition Sub and the Company and, subject to applicable Legal
          Requirements, the following additional effects as of the
          Effective Time:

                    (a)  Certificate of Incorporation.  The certificate of
                         ----------------------------
          incorporation of Acquisition Sub (the "Certificate of
          Incorporation"), will become the certificate of incorporation of
          the Surviving Corporation, and such Certificate of Incorporation
          may thereafter be amended and/or restated as provided therein and
          by the DGCL.

                    (b)  Bylaws.  The bylaws of Acquisition Sub, as in 
                         ------
          effect immediately prior to the Effective Time, will become the
          bylaws of the Surviving Corporation, and such bylaws may
          thereafter be amended or repealed in accordance with their terms
          and the Certificate of Incorporation and as provided by the DGCL.

                    (c)  Directors.  The directors of Acquisition Sub 
                         ---------
          immediately prior to the Effective Time will become the directors
          of the Surviving Corporation, each to hold office in accordance
          with the Certificate of Incorporation and bylaws of the Surviving
          Corporation and the DGCL and until the earlier of such director's
          resignation or removal or such director's successor is duly
          elected and qualified, as the case may be.

                    (d)  Officers.  The officers of Acquisition Sub 
                         ---------
          immediately prior to the Effective Time will become the officers
          of the Surviving Corporation, each to hold office in accordance
          with the Certificate of Incorporation and bylaws of the Surviving
          Corporation and the DGCL and until the earlier of such officer's
          resignation or removal or such officer's successor is duly
          appointed and qualified, as the case may be.

                    (e)  Properties and Liabilities.  All the properties, 
                         --------------------------
          rights, privileges, powers and franchises of the Company and
          Acquisition Sub will vest in the Surviving Corporation, and all
          debts, liabilities, agreements and duties of the Company and
          Acquisition Sub will become the debts, liabilities, agreements
          and duties of the Surviving Corporation.

                    (f)  New ICG Director.  David W. Garrison, Chief 
                         ----------------
          Executive Officer and Chairman of the Board of Directors of the
          Company, will become a member of the Board of Directors of ICG to
          hold office in accordance with the certificate of incorporation
          and bylaws of ICG and the DGCL and until the earlier of Mr.
          Garrison's resignation or removal or his successor is duly
          elected and qualified.

                    Section 2.2    Effective Time of the Merger.  Subject 
                                   ----------------------------
          to the terms and conditions of this Agreement, on the Closing
          Date the parties will prepare, sign and acknowledge, in
          accordance with the DGCL, a certificate of merger (the
          "Certificate of Merger") and deliver the Certificate of Merger to
          the Secretary of State of the State of Delaware (the "Secretary")
          for filing pursuant to the DGCL.  The Merger will become
          effective upon the filing of the Certificate of Merger with the
          Secretary.  As used in this Agreement, the "Effective Time" means
          the time at which the Certificate of Merger is filed with the
          Secretary.


                                     ARTICLE III
                                     -----------

                             CONVERSION OF CAPITAL STOCK

                    Section 3.1    Conversion of Stock.  At the Effective 
                                   -------------------
          Time, by virtue of the Merger and without any action on the part
          of ICG, Acquisition Sub, the Company or the holders of any of the
          following securities, the parties agree as follows:

                    (a)  Each share of Company Common Stock outstanding
          immediately prior to the Effective Time (except shares subject to
          Section 3.1(b)), shall be converted into the right to receive,
          and there shall be paid and issued as provided in this Agreement
          in exchange for such share, that number of shares of ICG Common
          Stock equal to the Exchange Ratio (as defined below), plus cash
          in lieu of any fractional share as provided in Section 3.4.  The
          "Exchange Ratio" shall be determined as follows: (i) if the ICG
          Closing Stock Price of a share of ICG Common Stock is greater
          than or equal to $22.125, the Exchange Ratio shall equal 0.8628,
          (ii) if the ICG Closing Stock Price of a share of ICG Common
          Stock is greater than or equal to $19.00 but less than $22.125,
          the Exchange Ratio shall equal a fraction (rounded to the nearest
          ten-thousandth) determined by dividing $19.0625 by the ICG
          Closing Stock Price of a share of ICG Common Stock, and (iii) if
          the ICG Closing Stock Price is less than $19.00, the Exchange
          Ratio shall equal 1.0078.

                    (b)  Each share of capital stock of the Company (the
          "Company Stock")  issued and outstanding immediately prior to the
          Effective Time and owned directly or indirectly by the Company,
          if any, will be canceled and retired, and no ICG Common Stock or
          other consideration will be delivered in exchange therefor.

                    (c)  Each share of common stock, par value $.01 per
          share, of Acquisition Sub issued and outstanding immediately
          prior to the Effective Time (except shares subject to
          Section 3.1(d)) will be converted into and will thereafter
          evidence and become that number of validly issued, fully paid,
          and nonassessable shares of common stock, par value $.01 per
          share, of the Surviving Corporation equal to the quotient of (a)
          the number of shares of Company Common Stock outstanding
          immediately prior to the Effective Time divided by (b) the number
          of shares of common stock of Acquisition Sub outstanding
          immediately prior to the Effective Time rounded, in the case of
          any fractional share, down to the nearest whole number.

                    (d)  Each share of the capital stock of Acquisition Sub
          issued and outstanding immediately prior to the Effective Time
          and owned directly or indirectly by Acquisition Sub, if any, will
          be canceled and retired, and no common stock of the Surviving
          Corporation or other consideration will be delivered in exchange
          therefor.

                    (e)  In the event ICG changes the number of shares of
          ICG Common Stock issued and outstanding after the date of this
          Agreement and prior to the Effective Time as a result of a stock
          split, stock dividend, or similar recapitalization with respect
          to ICG Common Stock and the record date therefor (in the case of
          a stock dividend) or the effective date thereof (in the case of a
          stock split or similar recapitalization for which a record date
          is not established) is after the date of this Agreement and prior
          to the Effective Time, the Exchange Ratio will be appropriately
          adjusted to reflect such stock split, stock dividend or similar
          recapitalization.

                    Section 3.2    Exchange of Certificates.
                                   ------------------------

                    (a)  Exchange Agent.  As of the Effective Time, ICG 
                         --------------
          shall enter into an agreement with a bank or trust company
          selected by ICG and reasonably acceptable to the Company which
          Person will act as exchange agent (the "Exchange Agent") in
          connection with the surrender of certificates that, prior to the
          Effective Time, evidenced outstanding shares of Company Common
          Stock ("Company Stock Certificates").  Prior to the Closing Date,
          ICG will deposit with the Exchange Agent for exchange in
          accordance with this Section 3.2 certificates evidencing the
          shares of ICG Common Stock to be issued in the Merger ("ICG
          Certificates"), which shares of ICG Common Stock will be deemed
          to be issued at the Effective Time.  At and following the
          Effective Time, ICG will deliver to the Exchange Agent such cash
          as may be required from time to time to make payments of cash in
          lieu of fractional shares of ICG Common Stock in accordance with
          Section 3.4.

                    (b)  Exchange.  As soon as practicable after the 
                         --------
          Effective Time, ICG will cause the Exchange Agent to mail to each
          Person who was a holder of record of Company Common Stock at the
          Effective Time:  (i) a letter of transmittal (which will specify
          that delivery will be effective, and risk of loss and title to
          any Company Stock Certificates will pass, only upon delivery of
          the Company Stock Certificates to the Exchange Agent and will be
          in such form and will have such other provisions that are
          specified by ICG and reasonably acceptable to the Company); and
          (ii) instructions for use in effecting the surrender of Company
          Stock Certificates in exchange for ICG Certificates (together
          with any dividend or distribution with respect thereto made after
          the Effective Time and any cash to be paid in lieu of fractional
          shares of ICG Common Stock pursuant to Section 3.4).  Upon
          surrender of a Company Stock Certificate for cancellation to the
          Exchange Agent or to such other agent or agents as may be
          appointed by ICG, together with such letter of transmittal, duly
          executed, and such other documents as may be required by the
          Exchange Agent or such other agent, the holder of such Company
          Stock Certificate will be entitled to receive in exchange
          therefor ICG Certificates representing the number of whole shares
          of ICG Common Stock that such holder has the right to receive
          pursuant to this Agreement (together with any dividend or
          distribution with respect thereto made after the Effective Time
          and any cash to be paid in lieu of fractional shares of ICG
          Common Stock pursuant to Section 3.4) and the Company Stock
          Certificate so surrendered will be canceled.  In the event of a
          transfer of ownership of Company Common Stock that is not
          registered in the transfer records of the Company, ICG
          Certificates representing the proper number of shares of ICG
          Common Stock may be issued to a Person other than the Person in
          whose name the surrendered Company Stock Certificate is
          registered if the Company Stock Certificate representing such
          Company Common Stock is presented to the Exchange Agent
          accompanied by all documents required to evidence and effect such
          transfer and by evidence reasonably satisfactory to ICG that any
          applicable stock transfer tax has been paid.  ICG will not
          directly or indirectly pay or reimburse any Person for any
          transfer taxes of the type referred to in the preceding sentence. 
          If any ICG Certificates are to be delivered to a Person other
          than the Person in whose name the Company Stock Certificates
          surrendered in exchange therefor are registered, it will be a
          condition to the delivery of such ICG Certificates that the
          Company Stock Certificates so surrendered are properly endorsed
          or accompanied by appropriate stock powers and otherwise in
          proper form for transfer, that such transfer otherwise is proper
          and that the Person requesting such transfer pay to the Exchange
          Agent any transfer or other taxes payable by reason of the
          foregoing or establishes to the satisfaction of the Exchange
          Agent that such taxes have been paid or are not required to be
          paid.

                    (c)  Certificates Not Exchanged.  After the Effective 
                         --------------------------
          Time, each outstanding Company Stock Certificate will, until
          surrendered for exchange in accordance with this Section 3.2, be
          deemed for all purposes to evidence ownership of the number of  
          whole shares of ICG Common Stock into which the shares of Company
          Common Stock (which, prior to the Effective Time, were
          represented thereby) are converted in accordance with Section
          3.1, together with the right to receive any dividend or
          distribution with respect thereto made after the Effective Time
          and any cash to be paid in lieu of fractional shares of ICG
          Common Stock pursuant to Section 3.4.

                    (d)  Expenses.  Except as otherwise expressly provided
                         --------
          in this Agreement, ICG will pay all charges and expenses,
          including those of the Exchange Agent, in connection with the
          exchange of shares of ICG Common Stock for shares of Company
          Common Stock, except any charges or expenses that are otherwise
          solely the liability of one or more holders of Company Common
          Stock.  Any ICG Certificates deposited with the Exchange Agent
          that remain unclaimed by the former stockholders of the Company
          after six months following the Effective Time will be delivered
          to ICG upon its demand, and any former stockholders of the
          Company who have not then complied with the instructions for
          exchanging their Company Stock Certificates will thereafter look
          only to ICG for exchange of Company Stock Certificates and for
          any dividend or distribution with respect thereto made after the
          Effective Time and any cash to be paid in lieu of fractional
          shares of ICG Common Stock pursuant to Section 3.4.

                    Section 3.3    Dividends and Other Distributions.  No 
                                   ---------------------------------
          dividends or other distributions declared or made after the
          Effective Time with respect to shares of ICG Common Stock with a
          record date after the Effective Time will be paid to the holder
          of any unsurrendered Company Stock Certificate with respect to
          the shares of ICG Common Stock issuable upon surrender thereof
          until the holder of such Company Stock Certificate surrenders
          such Company Stock Certificate in accordance with Section 3.2. 
          Subject to the effect of applicable Legal Requirements, following
          surrender of any such Company Stock Certificate, ICG will pay or
          cause to be paid, without interest, to the record holder of ICG
          Certificates issued in exchange therefor, (a) at the time of such
          surrender, the amount of cash in lieu of fractional shares of ICG
          Common Stock to which such holder is entitled pursuant to Section
          3.4 and the amount, if any, of dividends or other distributions
          by ICG with a record date after the Effective Time theretofore
          paid with respect to such whole shares of ICG Common Stock and
          (b) at the appropriate payment date, the amount of dividends or
          other distributions (if any) by ICG with a record date after the
          Effective Time but prior to surrender of such Company Stock
          Certificate and a payment date subsequent to such surrender
          payable with respect to such whole shares of ICG Common Stock.

                    Section 3.4    No Fractional Shares.
                                   --------------------

                    (a)  Cash Payment in Lieu of Fractional Shares.  No 
                         -----------------------------------------
          certificates or scrip representing fractional shares of ICG
          Common Stock will be issued upon the surrender of Company Stock
          Certificates pursuant to Section 3.2.  No such fractional
          interest will entitle the owner thereof to any rights as a
          security holder of ICG.  In lieu of any such fractional shares of
          ICG Common Stock, each holder of Company Common Stock entitled to
          receive shares of ICG Common Stock in the Merger, upon surrender
          of such Person's Company Stock Certificates for exchange pursuant
          to Section 3.2, will be entitled to receive an amount in cash
          (without interest), rounded to the nearest cent, determined by
          multiplying the fractional share interest in ICG Common Stock to
          which such holder would otherwise be entitled (after taking into
          account all shares of Company Common Stock held of record by such
          holder immediately prior to the Effective Time) by the market
          value of one share of ICG Common Stock at the Effective Time. 
          The market value of one share of ICG Common Stock at the
          Effective Time will be the ICG Closing Stock Price.

                    (b)  Deposit with Exchange Agent.  As soon as 
                         ---------------------------
          practicable after the determination of the amount of cash, if
          any, to be paid to holders of shares of Company Common Stock in
          lieu of any fractional shares of ICG Common Stock, ICG will
          promptly deposit with the Exchange Agent cash in the required
          amounts and the Exchange Agent will mail such amounts without
          interest to such holders; provided however, that no such amount
          will be paid to any holder with respect to any Company Stock
          Certificate prior to the surrender by such holder of such Company
          Stock Certificate.

                    Section 3.5    No Liability.  None of ICG, 
                                   ------------
          Acquisition Sub, the Company, the Surviving Corporation or the
          Exchange Agent will be liable to any holder of shares of Company
          Common Stock for any shares of ICG Common Stock, dividends or
          distributions with respect thereto or cash payable in lieu of
          fractional shares of ICG Common Stock delivered to a state
          abandoned property administrator or other public official
          pursuant to any applicable abandoned property, escheat or similar
          law.

                    Section 3.6    Lost Certificates.  If any Company Stock
                                   -----------------
          Certificate is lost, stolen or destroyed, the Exchange Agent will
          issue in exchange for such lost, stolen or destroyed Company
          Stock Certificate the shares of ICG Common Stock (and any
          dividend or distribution with respect thereto made after the
          Effective Time and any cash payable in lieu of fractional shares
          of ICG Common Stock pursuant to Section 3.4) deliverable in
          respect thereof as determined in accordance with the terms of
          this Agreement, subject to the condition that the Person to whom
          the ICG Common Stock (and any dividend or distribution with
          respect thereto made after the Effective Time and any cash
          payable in lieu of fractional shares pursuant to Section 3.4) is
          to be issued shall have (a) delivered to ICG an affidavit
          claiming such Company Stock Certificate to be lost, stolen, or
          destroyed and (b) if required by ICG, given ICG an indemnity
          satisfactory to ICG against any claim that may be made against
          ICG with respect to the Company Stock Certificate alleged to have
          been lost, stolen or destroyed.

                    Section 3.7    Treatment of Stock Options, Etc.   At 
                                   -------------------------------- 
          the Effective Time, each outstanding stock option, warrant or
          other right to acquire shares of Company Common Stock ("Company
          Options"), whether or not exercisable, as of the Effective Time
          will be converted into and become rights with respect to ICG
          Common Stock, and ICG shall assume each Company Option, in
          accordance with the terms and conditions of the stock option,
          warrant or other agreement by which it is evidenced, except that
          from and after the Effective Time, (i) each Company Option
          assumed by ICG may be exercised solely for shares of ICG Common
          Stock, (ii) the number of shares of ICG Common Stock subject to
          such Company Option will be equal to the number of shares of
          Company Common Stock subject to such Company Option immediately
          prior to the Effective Time multiplied by the Exchange Ratio, and
          (iii) the per share exercise price under each such Company Option
          will be adjusted by dividing the per share exercise price under
          each such Company Option by the Exchange Ratio and rounding up to
          the nearest cent.  Notwithstanding the provisions of clause
          (ii) of the preceding sentence, ICG will not be obligated to
          issue any fraction of a share of ICG Common Stock upon exercise
          of Company Options.

                    Section 3.8    Closing of the Company's Transfer Books. 
                                   ---------------------------------------
          At the Effective Time, the stock transfer books of the Company
          will be closed and no transfer of shares of Company Common Stock
          will be made thereafter.  In the event that, after the Effective
          Time, Company Stock Certificates are presented to the Surviving
          Corporation, they will be canceled and exchanged for ICG
          Certificates (and, if required, cash) as provided in Section
          3.2(b) and Section 3.4.

                    Section 3.9    Closing.  The closing of the 
                                   -------
          transactions contemplated by this Agreement (the "Closing") will
          take place (i) at the offices of Sherman & Howard L.L.C.,
          633 Seventeenth Street, Suite 3000, Denver, Colorado, at
          9:00 a.m. local time on the date that is the first Business Day
          after the day on which the last of the conditions set forth in
          Article VIII (excluding delivery of opinions and certificates) is
          fulfilled or waived or (ii) at such other place and time as ICG
          and the Company agree in writing.  The date on which the Closing
          occurs is referred to in this Agreement as the "Closing Date."

                    Section 3.10   No Repurchase Rights.  The holders of 
                                   --------------------
          ICG Common Stock received pursuant to the Merger or issuable
          pursuant to the Company Options shall have no right to require
          ICG or its Affiliates to repurchase any such shares of ICG Common
          Stock.


                                      ARTICLE IV
                                      ----------

                        REPRESENTATIONS AND WARRANTIES OF ICG

                    ICG represents and warrants to the Company as follows
          (it being understood that the representations and warranties
          relating to Acquisition Sub will be deemed to be made only as of
          the Closing Date):

                    Section 4.1    Organization and Qualification.  Each of
                                   ------------------------------
          ICG and Acquisition Sub is a corporation duly organized, validly
          existing and in good standing under the laws of the State of
          Delaware, and has all requisite corporate power and authority to
          carry on its business as it is now being conducted.  Each of ICG
          and Acquisition Sub is duly qualified as a foreign corporation to
          do business, and is in good standing, in each jurisdiction where
          the character of its properties owned or held under lease or the
          nature of its activities make such qualification necessary,
          except where the failure to be so qualified will not,
          individually or in the aggregate, have a Material Adverse Effect
          on it.

                    Section 4.2    Capitalization.
                                   --------------

                    (a)  As of September 30, 1997, the authorized capital
          stock of ICG consisted of:  (i) 100,000,000 shares of common
          stock, par value $.01 per share, of which 32,381,310 are issued
          and outstanding; (ii) 1,000,000 shares of preferred stock, par
          value $.01 per share, of which no shares are issued and
          outstanding; (iii) 4,786,680 shares of common stock of ICG
          issuable upon conversion of outstanding preferred stock of ICG
          and its Affiliates; and (iv) 7,439,998 shares of common stock
          issuable with respect to all other options, warrants, convertible
          debt  and similar rights to acquire shares of ICG Common Stock.

                    (b)  All shares of ICG Common Stock to be issued in
          connection with the Merger, when issued in accordance with this
          Agreement, will be duly authorized, validly issued, fully paid
          and nonassessable.

                    (c)  Acquisition Sub is a direct, wholly owned
          subsidiary of ICG.  ICG will own all of the issued and
          outstanding stock of (i) Acquisition Sub immediately prior to the
          Effective Time and (ii) Surviving Corporation immediately after
          the Effective Time, all of which stock will be owned beneficially
          and of record by ICG.


                    Section 4.3    Subsidiaries.  A list of all of the 
                                   ------------
          Equity Affiliates of ICG has been delivered to the Company, which
          list reflects the percentage and nature of ICG's ownership of
          each Subsidiary and Equity Affiliate of ICG.  Each of ICG's
          Subsidiaries is a corporation or partnership (including solely
          for purposes of this Section 4.3 a limited liability company)
          duly organized, validly existing and in good standing under the
          laws of its jurisdiction of incorporation or formation and has
          the corporate or partnership power to carry on its business as it
          is now being conducted or currently proposed to be conducted. 
          Each of ICG's Subsidiaries is duly qualified as a foreign
          corporation or partnership to do business, and is in good
          standing, in each jurisdiction where the character of its
          properties owned or held under lease or the nature of its
          activities makes such qualification necessary except where the
          failure to be so qualified will not have a Material Adverse
          Effect on ICG.  All the outstanding shares of capital stock of
          each of ICG's Subsidiaries that is a corporation are validly
          issued, fully paid and nonassessable.  Except as set forth on the
          list of Equity Affiliates, the shares of capital stock or
          partnership or other ownership interests in each of ICG's
          Subsidiaries or Equity Affiliates that are owned by ICG or by a
          Subsidiary of ICG are owned free and clear of any Liens, are not
          subject to and have not been issued in violation of any
          preemptive rights and have not been issued in violation of any
          federal or state securities laws or any other Legal Requirement. 
          Except as set forth on the list of Equity Affiliates, there are
          not, as of the date hereof, and at the Effective Time there will
          not be, any outstanding options, warrants, calls or other rights,
          agreements or commitments of any character, to which ICG or any
          of its Subsidiaries is a party, relating to the issued or
          unissued capital stock, other securities or partnership or other
          ownership interests in any of the Subsidiaries or Equity
          Affiliates of ICG.

                    Section 4.4    Authority Relative to this Agreement.  
                                   ------------------------------------  
          ICG has all requisite corporate power and authority to execute
          and deliver this Agreement and to consummate the transactions
          contemplated by this Agreement.  The execution and delivery of
          this Agreement and the consummation of the transactions
          contemplated by this Agreement by ICG have been duly authorized
          by the Board of Directors of ICG, and no other corporate
          proceedings on the part of ICG (other than the approval of ICG
          stockholders as contemplated by this Agreement) are necessary to
          authorize this Agreement and the transactions contemplated by
          this Agreement. The Board of  Directors of ICG has received the
          opinion of Gleacher NatWest Inc., as financial advisor to ICG,
          dated October 12, 1997, satisfactory to ICG and its Board of
          Directors to the effect that, as of the date of this Agreement,
          the Exchange Ratio is fair from a financial point of view to ICG
          and its stockholders.  This Agreement constitutes a valid and
          binding obligation of ICG enforceable against it in accordance
          with its terms, except (i) as enforcement may be limited by
          bankruptcy, insolvency or other similar Legal Requirements
          affecting the enforcement of creditors' rights generally, (ii) as
          the availability of indemnification and other remedies may be
          limited by federal and state securities laws and (iii) for
          limitations imposed by general principles of equity.

                    Section 4.5    No Breach; Required Consents.  The 
                                   ----------------------------
          execution and delivery of this Agreement by ICG does not, and the
          consummation of the transactions contemplated by this Agreement
          by ICG and Acquisition Sub will not:   (a) subject to approval of
          holders of ICG Common Stock, violate or conflict with the
          certificate of incorporation or bylaws of ICG or Acquisition Sub;
          (b) constitute a breach or default (or an event that with notice
          or lapse of time or both would become a breach or default) or
          give rise to any Lien, third-party right of termination,
          cancellation, modification or acceleration under any agreement or
          undertaking to which ICG or Acquisition Sub is a party or by
          which any of them is bound, except where such breach, default,
          Lien, third-party right of termination, cancellation,
          modification or acceleration would not have a Material Adverse
          Effect on ICG or Acquisition Sub; or (c) subject to obtaining the
          approvals and making the filings described in Section 4.6,
          constitute a violation of any applicable Legal Requirement,
          except where such violation would not have a Material Adverse
          Effect on ICG or Acquisition Sub.

                    Section 4.6    Consents and Approvals.  Neither the 
                                   ----------------------
          execution and delivery of this Agreement by ICG nor the
          consummation of the transactions contemplated by this Agreement
          by ICG and Acquisition Sub will require ICG or Acquisition Sub to
          make any filing or registration with, or obtain any
          authorization, consent or approval of, any Governmental Entity,
          except those required in connection, or in compliance, with the
          provisions of (i) the Hart-Scott-Rodino Antitrust Improvements
          Act of 1976, as amended (the "HSR Act"), (ii) the Communications
          Act of 1934, as amended, (iii) the Securities Act of 1933, as
          amended (the "Securities Act"), (iv) the Securities Exchange Act
          of 1934, as amended (the "Exchange Act") and (v) the corporation,
          securities or blue sky laws or regulations, or similar Legal
          Requirements, of various states of the United States, and other  
          than such filings, registrations, authorizations, consents or
          approvals the failure of which to make or obtain would not have a
          Material Adverse Effect on ICG or Acquisition Sub or prevent the
          consummation of the transactions contemplated by this Agreement.

                    Section 4.7    Reports and Financial Statements.
                                   --------------------------------

                    (a)  SEC Reports.  ICG has filed all required forms, 
                         -----------
          reports and documents required to be filed with the SEC since
          December 31, 1993 (collectively, the "ICG SEC Reports").  As of
          their respective dates or effective dates and except as the same
          may have been corrected, updated or superseded by means of a
          subsequent filing with the SEC prior to the date of this
          Agreement, none of the ICG SEC Reports, including any financial
          statements or schedules included or incorporated by reference
          therein, contained any untrue statement of a material fact or
          omitted to state a material fact required to be stated or
          incorporated by reference therein or necessary in order to make
          the statements therein, in light of the circumstances under which
          they were made, not misleading insofar as such statements relate
          to ICG.  ICG has delivered or made available to the Company, in
          the forms filed with the SEC, all the ICG SEC Reports.  

                    (b)  Financial Statements.  The audited consolidated 
                         --------------------
          financial statements of ICG contained in the ICG SEC Reports
          comply in all material respects with applicable accounting
          requirements and with the published rules and regulations of the
          SEC with respect thereto, were prepared in accordance with GAAP
          applied on a consistent basis during the periods involved (except
          as may be indicated in the notes thereto) and present fairly
          ICG's consolidated financial condition and the results of its
          operations as of the relevant dates thereof and for the periods
          covered thereby.  The unaudited consolidated interim financial
          statements of ICG contained in the ICG SEC Reports comply in all
          material respects with applicable accounting requirements and
          with the published rules and regulations of the SEC with respect
          thereto, were prepared on a basis consistent with prior interim
          periods (except as required by applicable changes in GAAP or in
          SEC accounting policies) and include all adjustments (consisting
          only of normal recurring accruals) necessary for a fair
          presentation of ICG's consolidated financial condition and
          results of operations for such periods.

                    (c)  Absence of Certain Changes.  Since the date of the
                         --------------------------
          most recent consolidated balance sheet of ICG included in ICG's 
          Quarterly Report on Form 10-Q filed with the SEC for the quarter
          ended June 30, 1997 (the "Most Recent ICG Balance Sheet"), there
          has not been any: (i) transaction, commitment, dispute or other
          event or condition (financial or otherwise) of any character
          (whether or not in the ordinary course of business) that,
          individually or in the aggregate, has had, or would have, a
          Material Adverse Effect on ICG (other than as a result of changes
          in laws or regulations of general applicability or any changes
          resulting from general economic, financial, market or industry-
          wide conditions); (ii) any declaration, setting aside or payment
          of any dividend or other distribution (whether in cash, stock or
          property) with respect to the capital stock of ICG; provided that
          dividends will be paid on shares of preferred stock issued by ICG
          after the date of this Agreement; or (iii) entry into any
          commitment or transaction material to ICG and its Subsidiaries
          taken as a whole (including any borrowing or sale of assets)
          except in the ordinary course of business consistent with past
          practice, other than the sale of exchangeable preferred shares of
          ICG Funding, LLC and the pending purchase of the stock of
          Communications Buying Group, Inc. and the pending issuance of ICG
          Common Stock to shareholders of that company.

                    (d)  Absence of Undisclosed Liabilities. ICG does not 
                         ----------------------------------
          have any indebtedness, liability or obligation required by GAAP
          to be reflected on a balance sheet that is not reflected or
          reserved against in the Most Recent ICG Balance Sheet except (i)
          liabilities, obligations and contingencies that were incurred
          after the date of the Most Recent ICG Balance Sheet in the
          ordinary course of business and which would not, in the
          aggregate, have a Material Adverse Effect and (ii) other
          liabilities, obligations and contingencies that would not, in the
          aggregate, have a Material Adverse Effect on ICG.

                    Section 4.8    Compliance with Law; Litigation.
                                   -------------------------------

                    (a)  ICG and its Subsidiaries hold all permits,
          licenses, franchises, variances, exemptions, concessions, leases,
          instruments, orders and approvals (the "ICG Permits") of all
          courts, administrative agencies or commissions or other
          governmental authorities or instrumentalities, domestic or
          foreign (each, a "Governmental Entity") required to be held under
          applicable Legal Requirements, except for such ICG Permits the
          failure of which to hold, individually or in the aggregate, does
          not have and, in the future is not likely to have, a Material
          Adverse Effect on ICG.  To ICG's Knowledge, ICG and its
          Subsidiaries are in compliance with the terms of the ICG Permits,
          except for such failures to comply that, individually or in the  
          aggregate, would not have a Material Adverse Effect on ICG.  To
          ICG's Knowledge, the businesses of ICG and its Subsidiaries are
          not being conducted in violation of any Legal Requirement, except
          for such violations which, individually or in the aggregate,
          would not have a Material Adverse Effect on ICG.  No
          investigation or review by any Governmental Entity with respect
          to ICG or any of its Subsidiaries is pending, or, to the
          Knowledge of ICG, threatened, nor has any Governmental Entity
          indicated to ICG in writing an intention to conduct the same,
          other than those the outcome of which would not reasonably be
          expected to have a Material Adverse Effect on ICG.

                    (b)  There is no suit, action or proceeding pending or,
          to the Knowledge of ICG, threatened, against or affecting ICG or
          any of its Subsidiaries that has had or is likely to have a
          Material Adverse Effect on ICG, nor is there any judgment,
          decree, injunction, rule or order of any Governmental Entity or
          arbitrator outstanding against ICG or any of its Subsidiaries
          that has had or is likely to have a Material Adverse Effect on
          ICG.

                    Section 4.9    Title to Assets.  ICG and its 
                                   ---------------
          Subsidiaries have valid title to all material assets reflected on
          the Most Recent ICG Balance Sheet, free and clear of any Lien
          except:  (a) landlord's Liens and Liens for property taxes not
          delinquent; (b) Liens that were created in the ordinary course of
          business and do not materially detract from the value of such
          assets or materially impair the use thereof in the operation of
          ICG's business; (c) leased interests in property owned by others
          and leased interests in property leased to others; and (d)
          zoning, building or similar restrictions, easements, rights-of-
          way, reservations of rights, conditions, or other restrictions or
          encumbrances relating to or affecting real property that do not,
          individually or in the aggregate, materially interfere with the
          use of such real property in the operation of ICG's business.

                    Section 4.10   Employee Matters.  ICG and its 
                                   ----------------
          Subsidiaries are in compliance with all applicable Legal
          Requirements relating to the employment of its employees,
          including any obligations relating to employment standards
          legislation, pay equity, occupational health and safety, labor
          relations and human rights legislation except for such failures
          to comply as do not have, and are not likely to have, a Material
          Adverse Effect on ICG. 

                    Section 4.11   ERISA.
                                   -----

                    (a)  Copies of all "employee benefit plans," as defined
          in ERISA, and all other material employee benefit arrangements,
          programs or payroll practices, including severance pay, sick
          leave, vacation pay, salary continuation for disability, deferred
          compensation, bonus, stock purchase, hospitalization, medical
          insurance, life insurance, tuition reimbursement, employee
          assistance and employee discounts, that ICG or any of its ERISA
          Affiliates maintains or has an obligation to make contributions
          (the "ICG Benefit Plans") have been delivered or made available
          to the Company.

                    (b)  Neither ICG nor any of its ERISA Affiliates has
          incurred any unsatisfied withdrawal liability, as defined in
          Section 4201 of ERISA, with respect to any multiemployer plan,
          nor has any of them incurred any liability due to the termination
          or reorganization of any multiemployer plan, except any such
          liability that would not have a Material Adverse Effect on ICG. 
          To the Knowledge of ICG, neither ICG nor any of its ERISA
          Affiliates reasonably expects to incur any liability due to a
          withdrawal from or termination or reorganization of a
          multiemployer plan, except any such liability that would not have
          a Material Adverse Effect on ICG.

                    (c)  Each ICG Benefit Plan that is intended to qualify
          under Section 401 of the Code and the trust maintained pursuant
          thereto is the subject of a favorable determination letter or
          notification letter issued by the Internal Revenue Service, and
          to the Knowledge of ICG, nothing has occurred with respect to any
          such plan since such determination letter or notification letter
          that is likely to result in the loss of such exemption or the
          imposition of any material liability, penalty or tax under ERISA
          or the Code.  To the Knowledge of ICG and its ERISA Affiliates,
          each ICG Benefit Plan has at all times been maintained in all
          material respects, by its terms and in operation, in accordance
          with all applicable Legal Requirements.

                    (d)  All contributions (including all employer
          contributions and employee salary reduction contributions)
          required to have been made under the ICG Benefit Plans or
          pursuant to applicable Legal Requirements (without regard to any
          waivers granted under Section 412 of the Code) to any funds or
          trusts established thereunder or in connection therewith have
          been made by the due date thereof (including any valid extension
          or grace period) and no accumulated funding deficiency exists
          with respect to any of the ICG Benefit Plans subject to Section
          412 of the Code.

                    (e)  To the Knowledge of ICG, there have been no
          violations of ERISA or the Code with respect to the filing of
          applicable reports, documents and notices regarding the ICG
          Benefit Plans with the Secretary of Labor and the Secretary of
          the Treasury or the furnishing of such reports, documents and
          notices to the participants or beneficiaries of the ICG Benefit
          Plans, except such violations that, individually or in the
          aggregate, would not have a Material Adverse Effect on ICG.

                    (f)  There are no pending actions, claims or lawsuits
          that have been asserted or instituted against the ICG Benefit
          Plans, the assets of any of the trusts under such plans or the
          plan sponsor or the plan administrator, or against any fiduciary
          of the ICG Benefit Plans, with respect to the operation of such
          plans (other than routine benefit claims), nor does ICG have
          Knowledge of facts that reasonably could be expected to form the
          basis for any such action, claim or lawsuit, except any such
          actions, claims or lawsuits that, individually or in the
          aggregate, would not have a Material Adverse Effect on ICG.  

                    Section 4.12   Operations of Acquisition Sub.  As of 
                                   -----------------------------
          the Closing, Acquisition Sub will have engaged in no other
          business activities other than in contemplation of this Agreement
          and the transactions contemplated by this Agreement and will have
          no material assets or liabilities other than its rights and
          obligations under this Agreement.

                    Section 4.13   No Broker.  Except for the fee payable 
                                   ---------
          by ICG to Gleacher NatWest Inc., no broker, finder or investment
          banker is entitled to any brokerage, finder's or other fee or
          commission in connection with the Merger or the transactions
          contemplated by this Agreement based upon arrangements made by or
          on behalf of ICG or Acquisition Sub.

                    Section 4.14   Taxes.  ICG and each of its Subsidiaries
                                   -----
          have timely filed all Tax returns required to be filed by any of
          them and have timely paid or have established an adequate reserve
          for the payment of, all Taxes owed in respect of the periods
          covered by such returns, except where the failure to file such
          Tax returns or timely pay or establish an adequate reserve for
          the payment of such Taxes will not have a Material Adverse Effect
          on ICG.  The information contained in such Tax returns is
          complete and accurate in all material respects.  Neither ICG nor
          any Subsidiary of ICG is delinquent in the payment of any Tax or
          other amount owed to any Governmental Entity, except where the
          amount owed, when paid, or the delinquency in paying the amount
          owed will not have a Material Adverse Effect on ICG.  There are  
          no claims or investigations pending or, to ICG's Knowledge,
          threatened against ICG or any of its Subsidiaries for past Taxes,
          except claims and investigations that would not have a Material
          Adverse Effect on ICG and adequate provision for which has been
          made on the Most Recent Balance Sheet.  None of ICG or its
          Subsidiaries has waived or extended any applicable statute of
          limitations relating to the assessment of any Taxes, other than
          state sales and use Taxes,  that would be payable by ICG or such
          Subsidiary.  For the purposes of this Agreement, the term "Tax"
          includes all federal, state, local and foreign income, profits,
          estimated, franchise, gross receipts, payroll, sales, employment,
          use, property, withholding, excise and other taxes, duties and
          assessments of any nature whatsoever together with all interest,
          penalties and additions imposed with respect to such amounts.

                    Section 4.15   Environmental Laws.
                                   ------------------

                    (a)  Each of ICG and its Subsidiaries is in compliance
          in all respects with all Environmental Laws, except where the
          failure to so comply would not have a Material Adverse Effect on
          ICG; and 

                    (b)  No orders, directions or notices have been issued
          pursuant to any Environmental Law and no Governmental Entity has
          submitted to any of ICG and its Subsidiaries any written request
          for information pursuant to any Environmental Law.

                    Section 4.16   Transactions with Affiliates.  Except as
                                   ----------------------------
          disclosed in the ICG SEC Reports, there is no lease, sublease,
          indebtedness, contract, agreement, commitment, understanding or
          other arrangement of any kind entered into by ICG with any
          officer, director or stockholder of ICG or any "affiliate" or
          "associate" of any of them (as those terms are defined in the
          Exchange Act) or of ICG, except, in each case, for compensation
          paid to directors and officers consistent with previously
          established policies (including normal merit increases in such
          compensation in the ordinary course of business), reimbursements 
          of ordinary and necessary expenses incurred in connection with
          their employment and amounts paid or benefits granted pursuant to
          ICG Benefit Plans and except for transactions that are not
          required to be disclosed pursuant to applicable Legal
          Requirements.

                    Section 4.17   Approval.
                                   --------

                    (a)  The Board of Directors of ICG at a meeting duly   
          called and held: (i) determined that the Merger is advisable and
          fair and in the best interests of ICG and its stockholders; (ii)
          approved the Merger and this Agreement and the transactions
          contemplated by this Agreement; and (iii) recommended the
          approval of this Agreement and the Merger by the holders of ICG
          Common Stock and directed that the Merger be submitted for
          consideration by ICG's stockholders at the Meeting.

                    (b)  The majority vote of the total votes cast at the
          Meeting with respect to this Agreement and the Merger is the
          minimum vote required for the adoption and approval of this
          Agreement, the Merger and the other transactions contemplated by
          this Agreement.

                    Section 4.18   Contracts.  Each of ICG and its 
                                   ---------
          Subsidiaries are in material compliance with each material
          contract or agreement to which it is a party, and each such
          contract is in full force and effect, without material monetary
          default by ICG or any such Subsidiary and, to the Knowledge of
          ICG, without any breach or default by any other party thereto,
          except where such breach or default would not result in a
          Material Adverse Effect.  No written notice has been received by
          ICG or any such Subsidiary or, to ICG's Knowledge, threatened
          regarding termination, suspension or material alteration or
          amendment thereof.  Each such contract or agreement is a valid
          and binding obligation of ICG or its Subsidiary, as the case may
          be, in accordance with its terms.

                    Section 4.19   Intellectual Property.  ICG and its 
                                   ---------------------
          Subsidiaries own or have the right to use all of its registered
          trademarks, service marks and copyrights used by ICG or its
          Subsidiaries.  To ICG's Knowledge, ICG and its Subsidiaries own
          or have the legal right to use, by license or otherwise, all of
          its Intellectual Property which is material to the operation of
          its business.  To ICG's Knowledge, the continued operation of the
          business of ICG and such Subsidiaries as currently conducted will
          not interfere with, infringe upon, misappropriate or conflict
          with any Intellectual Property of another Person.


                                      ARTICLE V
                                      ---------

                    REPRESENTATIONS AND WARRANTIES OF THE COMPANY

                    The Company represents and warrants to ICG as follows:

                    Section 5.1    Organization and Qualification.  The 
                                   ------------------------------
          Company is a corporation duly organized, validly existing and in
          good standing under the laws of the State of Delaware and has all
          requisite corporate power and authority to carry on its business
          as it is now being conducted.  The Company is duly qualified as a
          foreign corporation to do business, and is in good standing, in
          each jurisdiction where the character of its properties owned or
          held under lease or the nature of its activities makes such
          qualification necessary, except where the failure to be so
          qualified would not, individually or in the aggregate, have a
          Material Adverse Effect on the Company.

                    Section 5.2    Capitalization.
                                   --------------

                    (a)  The authorized capital stock of the Company
          consists of 40,000,000 shares of Company Common Stock, $.01 par
          value per share, of which 11,738,388 shares are issued and
          outstanding as of October 10, 1997, and 5,000,000 shares of
          preferred stock, $.01 par value per share, none of which are
          issued and outstanding and 200,000 of which have been designated
          Series C Preferred Stock.

                    (b)  The Company has delivered to ICG a schedule of all
          options, warrants, calls, subscriptions or other rights,
          agreements or commitments of any kind (including preemptive
          rights), to which the Company or any of its Subsidiaries is a
          party, relating to the issued or unissued capital stock or other
          securities of the Company.  Such schedule sets forth for all such
          options, warrants, calls, subscriptions or other rights,
          agreements or commitments that are outstanding (i) the number of
          shares of Company Common Stock issuable  pursuant thereto, (ii)
          the exercise or conversion price, and (iii) the date of grant. 
          Any such options, warrants, calls, subscriptions or other rights,
          agreements or commitments set forth on such schedule, if not
          exercised before the Effective Time, as of the Effective Time
          will be converted pursuant to Section 3.7.

                    (c)  All issued and outstanding shares of Company Stock
          have been duly authorized and validly issued and are fully paid
          and nonassessable, are not subject to, and have not been issued
          in violation of, any preemptive rights, and have not been issued
          in violation of any federal or state securities laws or any other
          Legal Requirement.

                    Section 5.3    Subsidiaries.  A list of all the Equity
                                   ------------
          Affiliates of the Company has been delivered to ICG, which list
          reflects the percentage and nature of the Company's ownership of 
          each Subsidiary and Equity Affiliate of the Company.  Each of the
          Company's Subsidiaries is a corporation or partnership duly
          organized, validly existing and in good standing under the laws
          of its jurisdiction of incorporation or formation and has the
          corporate or partnership power to carry on its business as it is
          now being conducted or currently proposed to be conducted.  Each
          of the Company's Subsidiaries is duly qualified as a foreign
          corporation or partnership to do business, and is in good
          standing, in each jurisdiction where the character of its
          properties owned or held under lease or the nature of its
          activities makes such qualification necessary except where the
          failure to be so qualified will not have a Material Adverse
          Effect on the Company.  All the outstanding shares of capital
          stock of each of the Company's Subsidiaries that is a corporation
          are validly issued, fully paid and nonassessable.  Except as set
          forth on the list of Equity Affiliates, the shares of capital
          stock or partnership or other ownership interests in each of the
          Company's Subsidiaries or Equity Affiliates that are owned by the
          Company or by a Subsidiary of the Company are owned free and
          clear of any Liens, are not subject to and have not been issued
          in violation of any preemptive rights and have not been issued in
          violation of any federal or state securities laws or any other
          Legal Requirement.  Except as set forth on the list of Equity
          Affiliates, there are not, as of the date hereof, and at the
          Effective Time there will not be, any outstanding options,
          warrants, calls or other rights, agreements or commitments of any
          character, to which the Company or any of its Subsidiaries is a
          party, relating to the issued or unissued capital stock, other
          securities or partnership or other ownership interests in any of
          the Subsidiaries or Equity Affiliates of the Company.

                    Section 5.4    Authority Relative to this Agreement.  
                                   ------------------------------------
          The Company has all requisite corporate power and authority to
          execute and deliver this Agreement and, subject to approval of
          this Agreement by the holders of the Company Stock, to consummate
          the transactions contemplated by this Agreement.  The execution
          and delivery of this Agreement and the consummation of the
          transactions contemplated by this Agreement have been duly
          authorized by the Company's Board of Directors.  Except for the
          approval of the holders of Company Stock, no other corporate
          proceedings on the part of the Company are necessary to authorize
          this Agreement and the transactions contemplated by this
          Agreement.  The Board of Directors of the Company has received
          the opinion of BT Alex. Brown Incorporated ("BT Alex. Brown") as
          financial advisor to the Company dated October 12, 1997
          satisfactory to the Company and its Board of Directors to the
          effect that, as of the date of this Agreement, the Exchange Ratio
          is fair to the Company's stockholders from a financial point of
          view.  This Agreement constitutes a valid and binding obligation
          of the Company enforceable in accordance with its terms except
          (i) as enforcement may be limited by bankruptcy, insolvency or
          other similar Legal Requirements affecting the enforcement of
          creditors' rights generally, (ii) as the availability of
          indemnification and other remedies may be limited by federal and
          state securities laws and (iii) for limitations imposed by
          general principles of equity.

                    Section 5.5    No Breach; Required Consents.  The 
                                   ----------------------------
          execution and delivery of this Agreement by the Company does not,
          and the consummation of the transactions contemplated by this
          Agreement by the Company will not:  (a) subject to the approval
          of holders of Company Stock, violate or conflict with the
          certificate of incorporation or bylaws of the Company;
          (b) constitute a breach or default (or an event that with notice
          or lapse of time or both would become a breach or default) or
          give rise to any Lien, third-party right of termination,
          cancellation, modification or acceleration under any agreement or
          undertaking to which the Company is a party or by which it is
          bound, except where such breach, default, Lien, third-party right
          of termination, cancellation, modification, or acceleration would
          not have a Material Adverse Effect on the Company; or (c) subject
          to obtaining the consents, approvals or authorizations and making
          the filings or registrations described in Section 5.6, constitute
          a violation of any Legal Requirement, except where such violation
          would not have a Material Adverse Effect on the Company.

                    Section 5.6    Consents and Approvals.  Neither the 
                                   ----------------------
          execution and delivery of this Agreement by the Company nor the
          consummation of the transactions contemplated by this Agreement
          by the Company will require the Company to make any filing or
          registration with, or obtain any authorization, consent or
          approval of, any Governmental Entity or any other Person, except
          those required in connection, or in compliance, with the
          provisions of (i) the HSR Act, (ii) the Communications Act of
          1934, as amended, (iii) the Securities Act, (iv) the Exchange Act
          and (v) the corporation, securities or blue sky laws or
          regulations, or similar Legal Requirements, of the various states
          of the United States, and other than such other filings,
          registrations, authorizations, consents or approvals the failure
          of which to make or obtain would not have a Material Adverse
          Effect on the Company or prevent the consummation of the
          transactions contemplated by this Agreement.

                    Section 5.7    Reports and Financial Statements.
                                   --------------------------------

                    (a)  SEC Reports.  The Company has filed all required 
                         -----------
          forms, reports and documents required to be filed with the SEC
          since December 31, 1993  (collectively, the "Company SEC
          Reports").  As of their respective dates or effective dates and
          except as the same may have been corrected, updated or superseded
          by means of a subsequent filing with the SEC prior to the date of
          this Agreement, none of the Company SEC Reports, including any
          financial statements or schedules included or incorporated by
          reference therein, contained any untrue statement of a material
          fact or omitted to state a material fact required to be stated or
          incorporated by reference therein or necessary in order to make
          the statements therein, in light of the circumstances under which
          they were made, not misleading.  The Company has delivered or
          made available to ICG, in the forms filed with the SEC, all the
          Company SEC Reports.

                    (b)  Financial Statements.  The audited consolidated 
                         --------------------
          financial statements of the Company contained in the Company SEC
          Reports comply in all material respects with applicable
          accounting requirements and with the published rules and
          regulations of the SEC with respect thereto, were prepared in
          accordance with GAAP applied on a consistent basis during the
          periods involved (except as may be indicated in the notes
          thereto) and present fairly the Company's consolidated financial
          condition and the results of its operations as of the relevant
          dates thereof and for the periods covered thereby.  The unaudited
          consolidated interim financial statements of the Company
          contained in the Company SEC Reports comply in all material
          respects with applicable accounting requirements and with the
          published rules and regulations of the SEC with respect thereto,
          were prepared on a basis consistent with prior interim periods
          (except as required by applicable changes in GAAP or in SEC
          accounting policies) and include all adjustments (consisting only
          of normal recurring accruals) necessary for a fair presentation
          of the Company's consolidated financial condition and results of
          operations for such periods.

                    (c)  Absence of Certain Changes.  Since the date of the
                         --------------------------
          most recent consolidated balance sheet of the Company included in
          the Company's Quarterly Report on Form 10-Q filed with the SEC
          for the quarter ended June 30, 1997 (the "Most Recent Company
          Balance Sheet"), there has not been any: (i) transaction,
          commitment, dispute or other event or condition (financial or
          otherwise) of any character (whether or not in the ordinary
          course of business) that, individually or in the aggregate, has
          had, or would have, a Material Adverse Effect on the Company
          (other than as a result of changes in laws or regulations of
          general applicability or any changes resulting from general
          economic, financial, market or industry-wide conditions); (ii)
          any declaration, setting aside or payment of any dividend or
          other distribution (whether in cash, stock or property) with
          respect to the capital stock of the Company; or (iii) entry into
          any commitment or transaction material to the Company and its
          Subsidiaries taken as a whole (including any borrowing or sale of
          assets) except in the ordinary course of business consistent with
          past practice.

                    (d)  Absence of Undisclosed Liabilities.  The Company 
                         ----------------------------------
          does not have any indebtedness, liability or obligation required
          by GAAP to be reflected on a balance sheet that is not reflected
          or reserved against in the Most Recent Company Balance Sheet
          except (i) liabilities, obligations and contingencies that were
          incurred after the date of the Most Recent Company Balance Sheet 
          in the ordinary course of business and which would not in the
          aggregate have a Material Adverse Effect and (ii) other
          liabilities, obligations and contingencies that would not, in the
          aggregate, have a Material Adverse Effect on the Company.

                    Section 5.8    Compliance with Law; Litigation.
                                   -------------------------------

                    (a)  To the Company's Knowledge, the Company and its
          Subsidiaries hold all permits, licenses, franchises, variances,
          exemptions, concessions, leases, instruments, orders and
          approvals (the "Company Permits") of all Governmental Entities
          required to be held under applicable Legal Requirements, except
          such Company Permits the failure of which to hold, individually
          or in the aggregate, does not have and, in the future is not
          likely to have, a Material Adverse Effect on the Company.  To the
          Company's Knowledge, the Company and its Subsidiaries are in
          compliance with the terms of the Company Permits, except for such
          failures to comply that, individually or in the aggregate, would
          not have a Material Adverse Effect on the Company.  To the
          Company's Knowledge, the businesses of the Company and its
          Subsidiaries are not being conducted in violation of any Legal
          Requirement, except for such violations which, individually or in
          the aggregate, would not have a Material Adverse Effect on the
          Company.  No investigation or review by any Governmental Entity
          with respect to the Company or any of its Subsidiaries is
          pending, or, to the Knowledge of the Company, threatened, nor has
          any Governmental Entity indicated to the Company in writing an
          intention to conduct the same, other than those the outcome of
          which would not reasonably be expected to have a Material Adverse
          Effect on the Company.

                    (b)  There is no suit, action or proceeding pending or,
          to the Knowledge of the Company, threatened against or affecting
          the Company or any of its Subsidiaries that has had or is likely
          to have a Material Adverse Effect on the Company nor is there any
          judgment, decree, injunction, rule or order of any Governmental
          Entity or arbitrator outstanding against the Company or any of
          its Subsidiaries that has had or is likely to have a Material
          Adverse Effect on the Company.

                    Section 5.9    Title to Assets.  The Company and its 
                                   ---------------
          Subsidiaries have valid title to all material assets reflected on
          the Most Recent Company Balance Sheet, free and clear of any Lien
          except: (a) landlord's Liens and Liens for property taxes not
          delinquent; (b) Liens that were created in the ordinary course of
          business and do not materially detract from the value of such
          assets or materially impair the use thereof in the operation of
          the Company's business; (c) leased interests in property owned by
          others; and leased interests in property leased to others; and
          (d) zoning, building or similar restrictions, easements,
          rights-of-way, reservations of rights, conditions, or other
          restrictions or encumbrances relating to or affecting real
          property that do not, individually or in the aggregate,
          materially interfere with the use of such real property in the
          operation of the Company's business.

                    Section 5.10   Employee Matters.  The Company and its 
                                   ----------------
          Subsidiaries are in compliance with all applicable Legal
          Requirements relating to the employment of employees, including
          any obligations relating to employment standards legislation, pay
          equity, occupational health and safety, labor relations and human
          rights legislation except for such failures to comply as do not
          have, and are not likely to have, a Material Adverse Effect on
          the Company.

                    Section 5.11   ERISA.
                                   -----

                    (a)  Copies of all "employee benefit plans," as defined
          in ERISA, and all other material employee benefit arrangements,
          programs or payroll practices, including severance pay, sick
          leave, vacation pay, salary continuation for disability, deferred
          compensation, bonus, stock purchase, hospitalization, medical
          insurance, life insurance, tuition reimbursement, employee
          assistance and employee discounts, that the Company or any of its
          ERISA Affiliates maintains or has an obligation to make
          contributions (the "Company Benefit Plans") have been delivered
          or made available to the Company.

                    (b)  Neither the Company nor any of its ERISA
          Affiliates has incurred any unsatisfied withdrawal liability, as
          defined in Section 4201 of ERISA, with respect to any
          multiemployer plan, nor has any of them incurred any liability
          due to the termination or reorganization of any multiemployer
          plan, except any such liability that would not have a Material
          Adverse Effect on the Company.  To the Knowledge of the Company,
          neither the Company nor any of its ERISA Affiliates reasonably
          expects to incur any liability due to a withdrawal from or
          termination or reorganization of a multiemployer plan, except any
          such liability that would not have a Material Adverse Effect on
          the Company.

                    (c)  Each Company Benefit Plan that is intended to
          qualify under Section 401 of the Code, and a form of trust that
          is similar in all material respects to the trust maintained
          pursuant thereto, have been determined to be exempt from federal
          income taxation under Section 501 of the Code by the Internal
          Revenue Service, and to the Knowledge of the Company, nothing has
          occurred with respect to any such plan since such determination
          that is likely to result in the loss of such exemption or the
          imposition of any material liability, penalty or tax under ERISA
          or the Code.  Each Company Benefit Plan has at all times been
          maintained in all material respects, by its terms and in
          operation, in accordance with all applicable Legal Requirements.

                    (d)  All contributions (including all employer
          contributions and employee salary reduction contributions)
          required to have been made under the Company Benefit Plans or
          pursuant to applicable Legal Requirements (without regard to any
          waivers granted under Section 412 of the Code) to any funds or
          trusts established thereunder or in connection therewith have
          been made by the due date thereof (including any valid extension
          or grace period) and no accumulated funding deficiency exists
          with respect to any of the Company Benefit Plans subject to
          Section 412 of the Code.

                    (e)  To the Knowledge of the Company, there have been
          no violations of ERISA or the Code with respect to the filing of
          applicable reports, documents and notices regarding the Company
          Benefit Plans with the Secretary of Labor and the Secretary of
          the Treasury or the furnishing of such reports, documents and
          notices to the participants or beneficiaries of the Company
          Benefit Plans, except such violations that, individually or in
          the aggregate, would not have a Material Adverse Effect on the
          Company.

                    (f)  There are no pending actions, claims or lawsuits
          that have been asserted or instituted against the Company Benefit
          Plans, the assets of any of the trusts under such plans or the
          plan sponsor or the plan administrator, or against any fiduciary
          of the Company Benefit Plans, with respect to the operation of
          such plans (other than routine benefit claims), nor does the
          Company have Knowledge of facts that reasonably could be expected
          to form the basis for any such action, claim or lawsuit, except
          any such actions, claims or lawsuits that, individually or in the
          aggregate, would not have a Material Adverse Effect on the
          Company.

                    Section 5.12   Approval.
                                   --------

                    (a)  The Board of Directors of the Company at a meeting
          duly called and held: (i) determined that the Merger is advisable
          and fair and in the best interests of the Company and its
          stockholders; (ii) approved the Merger and this Agreement and the
          transactions contemplated by this Agreement in accordance with
          the provisions of Section 251 of the DGCL; (iii) recommended the
          approval of this Agreement and the Merger by the holders of the
          Company Stock and directed that the Merger be submitted for
          consideration by the Company's stockholders at the Meeting; and
          (iv) adopted a resolution having the effect of causing the Merger
          not to be subject to Section 203 of the DGCL to the extent
          applicable, if applicable, and to the extent permitted by
          applicable Legal Requirements.

                    (b)  The vote of a majority of the outstanding shares
          of the Company Stock is the vote required for the adoption and
          approval of this Agreement, the Merger and the other transactions
          contemplated by this Agreement.

                    Section 5.13   Financial Advisor/Investment Banker.  
                                   -----------------------------------
          Except for amounts payable to BT Alex. Brown, pursuant to the
          letter agreement dated June 1, 1997, no broker, finder or
          investment banker is entitled to any brokerage, finder's or other
          fee or commission in connection with the Merger or the
          transactions contemplated by this Agreement based upon
          arrangements made by or on behalf of the Company or its
          Subsidiaries.  There has been delivered to ICG a true and
          complete copy of the agreement pursuant to which BT Alex. Brown
          has been retained to act as financial advisor to the Company and
          its Subsidiaries in connection with the Merger.

                    Section 5.14   Taxes.  The Company and each of its 
                                   -----
          Subsidiaries have timely filed all Tax returns required to be
          filed by any of them and have timely paid or have established an
          adequate reserve for the payment of, all Taxes owed in respect of
          the periods covered by such returns, except where the failure to
          file such Tax returns or timely pay or establish an adequate
          reserve for the payment of such Taxes, will not have a Material
          Adverse Effect on the Company.  The information contained in such
          Tax returns is complete and accurate in all material respects. 
          Neither the Company nor any Subsidiary of the Company is
          delinquent in the payment of any Tax or other amount owed to any
          Governmental Entity, except where the amount owed, when paid, or
          the delinquency in paying the amount owed will not have a
          Material Adverse Effect on the Company.  There are no claims or
          investigations pending or, to the Company's Knowledge, threatened
          against the Company or any of its Subsidiaries for past Taxes,
          except claims and investigations that would not have a Material
          Adverse Effect on the Company and adequate provision for which
          has been made on the Most Recent Balance Sheet.  None of the
          Company or its Subsidiaries has waived or extended any applicable
          statute of limitations relating to the assessment of any material
          Taxes that would be payable by the Company or such Subsidiary.

                    Section 5.15   Environmental Laws.
                                   ------------------

                    (a)  Each of the Company and its Subsidiaries is in
          compliance in all respects with all Environmental Laws, except
          where the failure to so comply would not have a Material Adverse
          Effect on the Company; and 

                    (b)  No orders, directions or notices have been issued
          pursuant to any Environmental Law and no Governmental Entity has
          submitted to any of the Company and its Subsidiaries any request
          for information pursuant to any Environmental Law.

                    Section 5.16   Transactions with Affiliates.  Except as
                                   ----------------------------
          disclosed in the Company SEC Reports, there is no lease,
          sublease, indebtedness, contract, agreement, commitment,
          understanding or other arrangement of any kind entered into by
          the Company with any officer, director or stockholder of the
          Company or any "affiliate" or "associate" of any of them (as
          those terms are defined in the Exchange Act) or of the Company,
          except, in each case, for compensation paid to directors and
          officers consistent with previously established policies
          (including normal merit increases in such compensation in the
          ordinary course of business), reimbursements of ordinary and
          necessary expenses incurred in connection with their employment
          and amounts paid or benefits granted pursuant to Company Benefit
          Plans and except for transactions that are not required to be
          disclosed pursuant to applicable Legal Requirements.

                    Section 5.17.  Contracts.  Each of the Company and its
                                   ---------
          Subsidiaries are in material compliance with each material
          contract or agreement to which it is a party, and each such
          contract is in full force and effect, without material monetary
          default by the Company or any such Subsidiary and, to the
          Knowledge of the Company, without any breach or default by any
          other party thereto, except where such breach or default would
          not result in a Material Adverse Effect.  No written notice has
          been received by the Company or any such Subsidiary or, to the
          Company's Knowledge, threatened regarding termination, suspension
          or material alteration or amendment thereof.  Each such contract
          or agreement is a valid and binding obligation of the Company or
          its Subsidiary, as the case may be, in accordance with its terms.

                    Section 5.18.  Intellectual Property.  The Company and
                                   ---------------------
          its Subsidiaries own or have the right to use all of its
          registered trademarks, service marks and copyrights used by the
          Company or its Subsidiaries.  To the Company's Knowledge, the
          Company and its Subsidiaries own or have the legal right to use,
          by license or otherwise, all of its Intellectual Property which
          is material to the operation of its business.  To the Company's
          Knowledge, the continued operation of the business of the Company
          and such Subsidiaries as currently conducted will not interfere  
          with, infringe upon, misappropriate or conflict with any
          Intellectual Property of another Person.


                                      ARTICLE VI
                                      ----------

                        CONDUCT OF BUSINESS PENDING THE MERGER

                    Section 6.1    Conduct of Business of the Company.  
                                   ----------------------------------
          Prior to the Effective Time, except as contemplated, permitted or
          required by this Agreement:

                    (a)  The Company will conduct, and will cause each of
          its Subsidiaries to conduct, its business in the ordinary course
          in accordance with past practice, and will use, and will cause
          each of its Subsidiaries to use, its reasonable best efforts to
          preserve intact its present business organization and to preserve
          relationships with customers, suppliers and others having
          business dealings with them.

                    (b)  The Company will not, and will not permit any of
          its Subsidiaries to:  (i) amend or propose to amend the
          certificate of incorporation or bylaws of the Company or any of
          its Subsidiaries; (ii) split, combine or reclassify the
          outstanding capital stock of, or issue or authorize or propose
          the issuance of any other securities in respect of, in lieu of or
          in substitution for shares of capital stock of, or other
          ownership interests in, the Company or any of its Subsidiaries;
          (iii) or declare, set aside or pay any dividend, distribution, or
          other payment to any stockholder, director or officer of the
          Company or any of its Subsidiaries, other than payments made in
          accordance with existing practices; (iv) directly or indirectly
          redeem, purchase or otherwise acquire or agree to redeem,
          purchase or otherwise acquire any shares of capital stock of, or
          other ownership interests in, the Company or any of its
          Subsidiaries other than existing contractual rights of repurchase
          at cost upon termination of employment; or (v) agree to do any of
          the foregoing.

                    (c)  Except with the written consent of ICG, which
          consent will not be unreasonably withheld, the Company will not,
          and will not permit any of its Subsidiaries to:  (i) encumber,
          issue, deliver or sell or agree to issue, deliver or sell any
          shares of capital stock of, or other equity interests (including
          any option, warrant or other similar right to acquire any equity
          interest) in the Company or any of its Subsidiaries, except for
          shares issued under the Company's Employee Stock Purchase Plan
          and except for options to purchase an aggregate of up to 150,000
          shares of Company Common Stock, exercisable for fair market value
          on the date of grant, issued consistent with past practices to
          employees either hired before or after October 12, 1997 and
          officers hired after October 12, 1997; (ii) acquire, lease or
          dispose of any assets other than in the ordinary course of
          business consistent with past practice; (iii) create, assume or
          incur any indebtedness except in the ordinary course of business
          consistent with past practice; (iv) encumber any of its assets
          other than in connection with equipment leases incurred in the
          ordinary course of business consistent with past practice;
          (v) enter into any other material transaction other than in each
          case in the ordinary course of business consistent with past
          practice; (vi) make any payment with respect to any indebtedness
          of the Company or its Subsidiaries except such payments that are
          scheduled to come due prior to the Effective Time; (vii) acquire
          by merging or consolidating with, or by acquiring assets of, or
          by purchase a substantial ownership interest in, or by any other
          method, any business or any other Person; or (viii) agree to do
          any of the foregoing.

                    (d)  Except with the written consent of ICG, which
          consent will not be unreasonably withheld, and except as required
          to comply with applicable Legal Requirements or existing Company
          Benefit Plans, the Company will not, and will not permit any of
          its Subsidiaries to:  (i) adopt, terminate or amend any bonus,
          profit sharing, compensation, severance, termination, stock
          option, pension, retirement, deferred compensation, employment or
          other Company Benefit Plan, agreement, trust, fund or other
          arrangement for the benefit or welfare of any director, officer
          or current or former employee; (ii) increase in any manner the
          compensation or benefits of any director, officer or employee
          (except normal increases in the ordinary course of business
          consistent with past practice); (iii) except as permitted under
          Section 6.1(c)(i), grant any award or option under any bonus,
          incentive, performance or other compensation plan or arrangement
          or Company Benefit Plan; (iv) take any action to fund or in any
          other way secure the payment of compensation or benefits
          (including any option, warrant or other similar right to acquire
          any equity interest) under any employee plan, agreement, contract
          or arrangement or Company Benefit Plan (except in the ordinary
          course of business consistent with past practice); or (v) agree
          to do any of the foregoing.

                    (e)  The Company will not take or agree to take, and
          will cause its Subsidiaries not to take or agree to take, any
          action that would: (i) make any representation or warranty of the
          Company set forth in this Agreement untrue or incorrect so as to
          cause the condition set forth in Section 8.3(a) of this Agreement
          not to be fulfilled as of the Effective Time; or (ii) result in  
          any breach of this Agreement or of the other conditions of this
          Agreement set forth in Section 8.1 or Section 8.3 of this
          Agreement not to be satisfied as of the Effective Time.

                    (f)  The Company will not, and will not permit any of
          its Subsidiaries to enter into any transaction with any officer,
          stockholder, director, consultant or employee of the Company of
          any Subsidiary thereof or any person or entity that is an
          "affiliate" or "associate" of any of the foregoing, as those
          terms are defined in Rule 12b-2 under the Exchange Act, whether  
          or not such transaction would be in the ordinary course of
          business.

                    (g)  The Company will take no action that reasonably
          could be expected to adversely affect the qualification of the
          Merger for pooling-of-interests accounting treatment under GAAP.

                    (h)  The Company and its Subsidiaries will (i) not take
          any action to initiate, solicit or encourage, directly or
          indirectly, any inquires or the making or implementation of any  
          proposal or offer (including, without limitation, any proposal or
          offer to its stockholders) with respect to a merger, acquisition,
          consolidation or similar transaction involving, or any purchase
          of all or any significant portion of the assets or any equity
          securities of, the Company or any of its Subsidiaries (any such
          proposal or offer being hereinafter referred to as an
          "Acquisition Proposal"), or engage in any negotiations
          concerning, or provide any confidential information or data to,
          or have any discussions with, any person or other entity or group
          as defined in Section 13(d)(3) of the Exchange Act relating to an
          Acquisition Proposal, or otherwise facilitate any effort or
          attempt to make or implement an Acquisition Proposal; (ii)
          immediately cease and cause to be terminated any existing
          activities, discussions or negotiations with any parties
          previously conducted with respect to any of the foregoing and
          take the necessary steps to inform the individuals or entities
          referred to above of the obligations undertaken in this Section
          6.1(h); and (iii) notify ICG immediately if any such inquiries or
          proposals are received by, any such information is requested from
          or any such negotiations or discussions are sought to be
          initiated or continued with, the Company or any of its
          Subsidiaries.  Nothing contained in this Section 6.1(h) will
          prohibit the Board of Directors of the Company from (1)
          furnishing information to, or entering into discussions or
          negotiations with, any person or other entity or group that makes
          an Acquisition Proposal or recommending to its stockholders that
          they accept such Acquisition  Proposal, if (A) the Board of
          Directors of the Company reasonably determines in good faith,
          after consultation with outside counsel, that such action is
          consistent with its fiduciary duties to stockholders imposed by
          law, (B) prior to furnishing such information to, or entering
          into discussions or negotiations with, such person or entity, the
          Company provides written notice to ICG to the effect that it is
          furnishing information to, or entering into discussions or
          negotiations with, such person or entity, and (C) subject to any
          confidentiality agreement with such other party (which the
          Company determines in good faith, after consultation with outside
          counsel, is required to be executed in order for the Board of
          Directors to act consistently with its fiduciary duties to  
          stockholders imposed by law), the Company keeps ICG informed of
          the status (not the terms) of any such discussions or
          negotiations; and (2) to the extent applicable, complying with
          Rule 14e-2 promulgated under the Exchange Act with regard to an
          Acquisition Proposal.  Nothing in this Section 6.1(h) shall (x)
          permit any party to terminate this Agreement (except as
          specifically provided in Section 9.1(d)), (y) permit any party to
          enter into any agreement with respect to an Acquisition Proposal
          during the term of this Agreement (it being agreed that during
          the term of this Agreement, no party shall enter into any   
          agreement with any person that provides for, or in any way
          facilitates, an Acquisition Proposal (other than a
          confidentiality agreement in customary form)), or (z) breach any
          obligation of any party under this Agreement.

                    (i)  The Board of Directors of the Company will
          recommend to the stockholders of the Company the approval of the
          Merger, unless the Board of Directors reasonably determines in
          good faith, after consultation with outside counsel, that such
          action would be inconsistent with its fiduciary duties to
          stockholders as required by law and, if such determination is
          made, will give written notice to ICG of such determination
          within two Business Days of the making of such determination. 
          Upon the issuance of such written notice to ICG, and upon the
          written election of ICG, the Company will negotiate in good faith
          with ICG for a period of two Business Days regarding such
          adjustments in the terms of the Merger as would enable the Board
          of Directors of the Company, consistent with its fiduciary duties
          to the stockholders, to proceed to recommend the Merger to the
          stockholders of the Company as contemplated in this Agreement.

                    (j)        Upon the request of ICG, the Company will
          prepare and deliver to ICG, within twenty days after such
          request, such financial statements (including audited financial
          statements) as may be required by ICG to meet its financial
          reporting obligations (including requirements under applicable
          securities laws).

                    (k)  The Company shall take no action that reasonably
          could be expected to adversely affect the qualification of the
          Merger as a reorganization under Section 368(a) of the Code.

                    (l)  The Company will use its reasonable best efforts
          to dispose of all of its interest in Internetcom do Brazil, S.A.,
          or, alternatively, acquire and hold more than 51 percent of the
          equity interests of such company.

                    Section 6.2    Conduct of Business of ICG.  Prior to 
                                   --------------------------
          the Effective Time, except as contemplated, permitted or required
          by this Agreement:

                    (a)  ICG will conduct, and will cause each of its
          Subsidiaries to conduct, its business in the ordinary course in
          accordance with past practice, and will use, and will cause each
          of its Subsidiaries to use, its reasonable best efforts to
          preserve intact its present business organization and to preserve
          relationships with customers, suppliers and others having
          business dealings with them.

                    (b)  ICG will not take or agree to take, and will cause
          its Subsidiaries not to take or agree to take, any action that
          would (i) make any representation or warranty of ICG set forth in
          this Agreement untrue or incorrect so as to cause the condition
          set forth in Section 8.2(a) of this Agreement not to be fulfilled
          as of the Effective Time or (ii) result in any breach of this
          Agreement or of the other conditions set forth in Section 8.1 or
          Section 8.2 of this Agreement not to be satisfied as of the
          Effective Time.

                    (c)  Without the prior written consent of the Company,
          for a period ending upon the earlier of the termination of this
          Agreement or twelve months after the date of this Agreement, ICG
          will not except as provided in this Agreement (i) acquire or
          agree to acquire any voting securities or direct or indirect
          rights to acquire any voting securities of the Company or (ii)
          (1) make or participate in any "solicitation" of "proxies" to
          vote (as such terms are used in the proxy rules of the SEC) with
          respect to the voting of any securities of the Company, (2) form,
          join or in any way participate in a group within the meaning of
          Section 13(d)(3) of the Exchange Act with respect to any voting
          securities of the Company or (3) otherwise act, alone or with
          others, to seek to control the management, Board of Directors or
          policies of the Company.  ICG has not taken any of these actions
          prior to the date of this Agreement.

                    (d)  The Board of Directors of ICG will recommend to
          the stockholders of ICG the approval of the Merger, unless the
          Board of Directors reasonably determines in good faith, after
          consultation with outside counsel, that such action would be
          inconsistent with its fiduciary duties to its stockholders as
          required by law and, if such determination is made, will give
          written notice to the Company within two Business Days of the
          making of such determination.  Upon the issuance of such written
          notice to the Company, and upon the election of the Company, ICG
          will negotiate in good faith with the Company for a period of two
          Business Days regarding such adjustments in the terms of the
          Merger as would enable the Board of Directors of ICG, consistent
          with its fiduciary duties to the stockholders, to proceed to 
          recommend the Merger to the stockholders of ICG as contemplated
          by this Agreement.

                    (e)  ICG shall take no action that reasonably could be
          expected to adversely affect the qualification of the Merger for
          pooling-of-interests accounting treatment under GAAP.

                    (f)  ICG shall take no action that reasonably could be
          expected to adversely affect the qualification of the Merger as a
          reorganization under Section 368(a) of the Code.

                    (g)  ICG shall not enter into any agreement with any
          Person for the purchase or other acquisition by such Person of
          more than 50 percent of the ICG Common Stock, unless such Person
          agrees in writing prior to the Effective Time to vote in favor of
          the Merger.

                                     ARTICLE VII
                                     -----------

                                ADDITIONAL AGREEMENTS

                    Section 7.1    Access and Information.  Each of the
                                   ----------------------
          Company and ICG and their respective Subsidiaries will afford to
          the other and to the other's accountants, counsel and other
          representatives full access during normal business hours (and at
          such other times as the parties may mutually agree) throughout
          the period prior to the Effective Time to all of its properties,
          books, contracts, commitments, records and personnel.

                    Section 7.2    SEC Filings.
                                   -----------

                    (a)  The Company and ICG will prepare jointly, and as
          soon as reasonably practicable after the date of this Agreement,
          file with the SEC a joint proxy statement/registration statement
          (the "Preliminary Joint Proxy Statement/Prospectus") comprising
          preliminary proxy materials of the Company and ICG under the
          Exchange Act with respect to the Merger and a Registration
          Statement on Form S-4 and preliminary prospectus of ICG under the
          Securities Act with respect to the ICG Common Stock to be issued
          in the Merger, and will thereafter use their respective
          reasonable best efforts to respond to any comments of the SEC
          with respect thereto and to cause a definitive joint proxy
          statement/registration statement (including all supplements and
          amendments thereto, the "Joint Proxy Statement/Prospectus") and
          proxy to be mailed to the Company's and ICG's stockholders as
          promptly as practicable. 

                    (b)  As soon as reasonably practicable after the date
          hereof, the Company and ICG will prepare and file any other
          filings relating to the Merger and the other transactions
          contemplated hereby that are required to be filed by each under
          the Exchange Act and other applicable Legal Requirements
          (collectively "Other Filings"), and will use their reasonable
          best efforts to respond to any comments of the SEC or any other
          appropriate government official with respect thereto.

                    (c)  The Company, on the one hand, and ICG, on the
          other, will cooperate with each other and provide all information
          necessary to prepare the Preliminary Joint Proxy
          Statement/Prospectus, the Joint Proxy Statement/Prospectus and
          the Other Filings (collectively "SEC Filings") and will provide
          promptly to the other party any information that such party may
          obtain that could necessitate amending any such document.

                    (d)  Each of the Company and ICG will notify the other
          promptly of the receipt of any comments from the SEC or its staff
          or any other government official and of any requests by the SEC
          or its staff or any other government official for amendments or
          supplements to any of the SEC Filings or for additional
          information and will supply the other with copies of all
          correspondence between the Company or any of its representatives
          or ICG or any of its representatives, as the case may be, on the
          one hand, and the SEC or its staff or any other government
          official, on the other hand, with respect thereto.  If at any
          time prior to the Effective Time, any event occurs that should be
          set forth in an amendment of, or a supplement to, any of the SEC
          Filings, the Company and ICG promptly will prepare and file such
          amendment or supplement and will distribute such amendment or
          supplement as required by applicable Legal Requirements,
          including, in the case of an amendment or supplement to the Joint
          Proxy Statement/Prospectus, mailing such supplement or amendment
          to the Company's stockholders.

                    (e)  ICG covenants that the SEC Filings (other than any
          information provided by the Company for inclusion in the SEC
          Filings) (i) will comply in all material respects with the
          Securities Act and the Exchange Act and (ii) will not contain any
          untrue statement of a material fact or omit to state any material
          fact required to be stated therein or necessary in order to make
          the statements contained therein, in light of the circumstances
          under which they are made, not misleading.

                    (f)  The Company covenants that the SEC Filings (other
          than any information provided by ICG for inclusion in the SEC
          Filings) (i) will comply in all material respects with the  
          Securities Act and the Exchange Act and (ii) will not contain any
          untrue statement of a material fact or omit to state any material
          fact required to be stated therein or necessary in order to make
          the statements therein, in light of the circumstances under which
          they were made, not misleading.

                    (g)  ICG will be responsible for all reasonable
          expenses incurred in complying with this Section 7.2, including
          all registration, qualification and filing fees, printing
          expenses, fees and disbursements of counsel (other than counsel
          to the Company) and applicable blue-sky fees and expenses.

                    (h)  (i)  ICG will indemnify, defend, and hold
          harmless the Company, its officers, directors, employees and
          agents and each other Person, if any, who controls any of the
          foregoing within the meaning of Section 15 of the Securities Act
          or Section 20 of the Exchange Act, against any losses, claims,
          damages or liabilities (collectively, "Losses"), joint or
          several, to which any of the foregoing may become subject under
          the Securities Act or the Exchange Act or otherwise, insofar as
          such Losses (or actions in respect thereof) arise out of or are
          based upon (A) an untrue statement or alleged untrue statement of
          a material fact contained in any SEC Filing, or (B) the omission
          or alleged omission to state therein a material fact required to
          be stated therein or necessary to make the statements therein, in
          light of the circumstances under which they were made, not
          misleading, provided that such misstatement or omission was based
          on or omitted from information provided by ICG in writing for
          inclusion in the SEC Filings or was made in reliance upon and in
          conformity with such information.  ICG promptly will reimburse
          the Company and each such officer, director, employee, agent and
          controlling Person for any legal or any other expenses reasonably
          incurred by any of them in connection with investigating or
          defending any such Losses (or action in respect thereof).

                         (ii) If this Agreement is terminated prior to the
          consummation of the Merger, the Company will indemnify, defend
          and hold harmless each of ICG and Acquisition Sub and their
          officers, employees and agents and directors and each other     
          Person, if any, who controls any of the foregoing within the
          meaning of Section 15 of the Securities Act or Section 20 of the
          Exchange Act, against any Losses, joint or several, to which any
          of the foregoing may become subject under the Securities Act or
          the Exchange Act or otherwise, insofar as such Losses (or actions
          in respect thereof) arise out of or are based upon (A) an untrue
          statement or alleged untrue statement of a material fact
          contained in any SEC Filing or (B) the omission or alleged
          omission to state a material fact required to be stated therein
          or necessary to make the statements therein, in light of the
          circumstances under which they were made, not misleading,
          provided that the misstatement or omission was based on or
          omitted from information provided by the Company in writing for
          use in the SEC Filings or was made in reliance upon and in
          conformity with such information.  The Company promptly will
          reimburse ICG and Acquisition Sub and each such officer,
          director, employee, agent and controlling Person for any legal or
          any other expenses reasonably incurred by any of them in
          connection with investigating or defending any such Losses (or
          action in respect thereof).

                         (iii)     For purposes of this Section 7.2, (A)
          "Indemnifying Party" means the Person having an obligation
          hereunder to indemnify any other Person pursuant to this
          Section 7.2, (B) "Indemnified Party" means the Person having the
          right to be indemnified pursuant to this Section 7.2 and (C) any
          information concerning the Company that is included in any SEC
          Filing that is provided to the Company or its counsel for review
          within a reasonable period before filing or use thereof and to
          which the Company has not provided written notice of objection to
          ICG will be deemed to have been provided by the Company for
          inclusion in such SEC Filing.  Whenever any claim for
          indemnification arises under this Section 7.2, the Indemnified
          Party will promptly notify the Indemnifying Party in writing of
          such claim and, when known, the facts constituting the basis for
          such claim (in reasonable detail).  Failure by the Indemnified
          Party so to notify the Indemnifying Party will not relieve the
          Indemnifying Party of any liability hereunder except to the
          extent that such failure materially prejudices the Indemnifying
          Party.

                         (iv) After such notice, if the Indemnifying Party
          undertakes to defend any such claim, then the Indemnifying Party
          will be entitled, if it so elects, to take control of the defense
          and investigation with respect to such claim and to employ and
          engage attorneys of its own choice to handle and defend such
          claim, at the Indemnifying Party's cost, risk and expense, upon
          notice to the Indemnified Party of such election, which notice
          acknowledges the Indemnifying Party's obligation to provide
          indemnification hereunder.  The Indemnifying Party will not
          settle any third-party claim that is the subject of
          indemnification without the written consent of the Indemnified
          Party, which consent will not be unreasonably withheld; provided
          however, that the Indemnifying Party may settle a claim without
          the Indemnified Party's consent if the settlement (A) makes no
          admission or acknowledgment of liability or culpability with
          respect to the Indemnified Party, (B) includes a complete release
          of the Indemnified Party and (C) does not require the Indemnified
          Party to make any payment or forego or take any action.  The
          Indemnified Party will cooperate in all reasonable respects with
          the Indemnifying Party and its attorneys in the investigation,
          trial and defense of any lawsuit or action with respect to such
          claim and any appeal arising therefrom (including the filing in
          the Indemnified Party's name of appropriate cross claims and
          counterclaims) and the Indemnifying Party will reimburse the
          Indemnified Party for all reasonable direct out-of-pocket
          expenses incurred by the Indemnified Party in connection with
          such cooperation. The Indemnified Party may, at its own expense,
          participate in any investigation, trial and defense of such 
          lawsuit or action controlled by the Indemnifying Party and any
          appeal arising therefrom.  If, after receipt of a claim notice
          pursuant to Section 7.2(h)(iii), the Indemnifying Party does not
          undertake to defend any such claim, the Indemnified Party may,
          but will have no obligation to, contest any lawsuit or action
          with respect to such claim and the Indemnifying Party will be
          bound by the result obtained with respect thereto by the
          Indemnified Party (including the settlement thereof without the
          consent of the Indemnifying Party).  If there are one or more
          defenses available to the Indemnified Party that conflict with,
          or are additional to, those available to the Indemnifying Party,
          the Indemnified Party will have the right, at the expense of the
          Indemnifying Party, to participate in the defense of the lawsuit
          or action; provided however, that the Indemnified Party may not
          settle such lawsuit or action without the consent of the
          Indemnifying Party, which consent will not be unreasonably
          withheld.

                         (v)  If the indemnification provided for in this
          Section 7.2(h) is for any reason unavailable to the Indemnified
          Party in respect of any Losses (or action in respect thereof)
          then the Indemnifying Party will, in lieu of indemnifying the
          Indemnified Party, contribute to the amount paid or payable by
          the Indemnified Party as a result of such Losses (or action in
          respect thereof), in such proportion as is appropriate to reflect
          the relative fault of the Indemnifying Party on the one hand and
          the Indemnified Party on the other with respect to the statement
          or omission that resulted in such Losses (or action in respect
          thereof) as well as any other relevant equitable considerations. 
          Relative fault with respect to an untrue or alleged untrue
          statement or omission of a material fact will be determined by
          reference to whether the untrue or alleged untrue statement or
          omission of a material fact related to information supplied by
          the Indemnifying Party on the one hand or the Indemnified Party
          on the other, the intent of the parties and their relative
          Knowledge, access to information and opportunity to correct or
          prevent such statement or omission.  The amount paid or payable
          by the Indemnified Party as a result of the Losses (or action in
          respect thereof) referred to above will be deemed to include any 
          legal or other expenses reasonably incurred by the Indemnified
          Party in connection with investigating, trying or defending any
          such action or claim.  No Person guilty of fraudulent
          misrepresentation (within the meaning of Section 11(f) of the
          Securities Act) will be entitled to contribution from any Person
          who was not guilty of such fraudulent misrepresentation.

                    Section 7.3    Meetings of Stockholders.  Each of the 
                                   ------------------------
          Company and ICG will take all action necessary, in accordance
          with the DGCL, the rules and regulations of the National
          Association of Securities Dealers, Inc. ("NASD") and the
          certificate of incorporation and bylaws of the Company or ICG, as
          applicable, to duly call, give notice of, convene and hold a
          meeting of its stockholders as promptly as practicable, to
          consider and vote upon the adoption and approval of this
          Agreement (as a plan of merger under Section 251 of the DGCL),
          the Merger and the other transactions contemplated by this
          Agreement (each, individually, the "Meeting"), to the extent such
          approval is required by the DGCL, the NASD or the certificate of
          incorporation of the Company or ICG, as applicable.  Each of the
          Company and ICG will use its best efforts to hold such meetings 
          at the same date and time.

                    Section 7.4    Compliance with the Securities Act.  
                                   ----------------------------------
          Prior to the Closing Date, the Company will cause to be delivered
          to ICG a letter from the Company, identifying all Persons who
          are, in its opinion, as of the date of this Agreement,
          "affiliates" of the Company as that term is used in
          paragraphs (c) and (d) of Rule 145 under the Securities Act.  The
          Company shall use its reasonable best efforts to cause each such
          Person to deliver to ICG not later than October 20, 1997, a
          written agreement substantially in the form of Exhibit A.  The
          Company will, as of the date of the Meeting of its stockholders,
          identify other Persons who at that time are affiliates, and use
          its reasonable best efforts to cause each such Person to deliver
          to ICG on a prompt basis such a written agreement.  ICG may cause
          the ICG Certificates evidencing shares of ICG Common Stock issued
          to such Persons to bear a legend referring to the applicability
          of paragraphs (c) and (d) of Rule 145 under the Securities Act.  

                    Section 7.5    Reasonable Best Efforts.  Without 
                                   -----------------------
          limiting the termination and other rights of the parties under
          this Agreement (and subject to the parties' rights to take
          certain actions pursuant to Section 6.1(h), Section 6.1(i) and
          Section 6.2(d) consistent with the fiduciary duties of their
          respective Boards of Directors) each of the parties to this
          Agreement will use its commercially reasonable best efforts to
          take, or cause to be taken, all appropriate action, and to do, or
          cause to be done, all things necessary, proper or advisable under
          applicable Legal Requirements to consummate and make effective
          the transactions contemplated by this Agreement in the most
          expeditious manner practicable, including the satisfaction of all
          conditions to the Merger.

                    Section 7.6    Confidentiality and Public 
                                   --------------------------
          Announcements.  Each party to this Agreement agrees that it will
          -------------
          treat this Agreement and all negotiations and communications
          between them relating to this Agreement, the Merger or otherwise,
          and all information disclosed to a party by the other party, as
          confidential.  No party to this Agreement will make any public
          announcements or otherwise communicate with any news media with
          respect to this Agreement or any of the transactions contemplated
          by this Agreement without prior approval of the other party,
          which approval will not unreasonably be withheld, as to the
          timing and contents of any such announcement as may be reasonable
          under the circumstances; provided however, that nothing contained
          herein will prevent any party from promptly making all filings
          with Governmental Entities that may, in its reasonable judgment,
          be required or advisable in connection with the execution and
          delivery of this Agreement or the consummation of the
          transactions contemplated by this Agreement so long as such party
          gives timely notice to the other parties of the anticipated
          disclosure and cooperates with the other party in designing
          reasonable procedural and other safeguards to preserve, to the
          maximum extent possible, the confidentiality of all information
          furnished by the other party pursuant to this Agreement. 

                    Section 7.7    Notification.  In the event of, or after
                                   ------------
          obtaining Knowledge of the occurrence or threatened occurrence
          of, any fact or circumstance that would cause or constitute a
          breach or violation of any of its representations, warranties,
          covenants or other agreements set forth herein, each party to
          this Agreement promptly will give notice thereof to the other
          party and will use its best efforts to prevent or remedy such
          breach.

                    Section 7.8    HSR Act Filings.  ICG and the Company 
                                   ---------------
          each will make or cause to be made an appropriate filing of a
          Notification and Report Form pursuant to the HSR Act no later
          than 15 Business Days after the date of this Agreement.  Each
          such filing will request early termination of the waiting period
          imposed by the HSR Act.  The Company and ICG each will use its
          reasonable best efforts to respond or cause a response to be made
          as promptly as reasonably practicable to any inquiries received
          from the Federal Trade Commission (the "FTC") and the Antitrust
          Division of the Department of Justice (the "Antitrust Division")
          for additional information or documentation and to respond as
          promptly as reasonably practicable to all inquiries and requests
          received from any other Governmental Entity in connection with
          antitrust matters; provided however, that nothing contained
          herein will be deemed to preclude either the Company or ICG from
          negotiating reasonably with any Governmental Entity regarding the
          scope and content of any such requested information or
          documentation.  The Company and ICG each will use their
          respective reasonable best efforts to overcome any objections
          that may be raised by the FTC, the Antitrust Division or any
          other Governmental Entity having jurisdiction over antitrust
          matters.  Notwithstanding the foregoing, neither ICG nor the
          Company will be required to make any significant change in the
          operations or activities of the business (or any material assets
          employed therein) of ICG or any of its Affiliates, or of the
          Company or any of its Affiliates, as the case may be, if ICG or
          the Company, as the case may be, determines in good faith that
          such change would be materially adverse to the operations or
          activities of the business (or any material assets employed
          therein) of ICG or any of its Affiliates or the Company or any of
          its Affiliates, as the case may be.

                    Section 7.9    Indemnification of Executives.
                                   -----------------------------

                    (a)  Indemnification.  ICG will cause the Surviving 
                         ---------------
          Corporation to, and, should the Surviving Corporation fail or be
          unable to do so, ICG shall, indemnify, defend and hold harmless
          each person who is now, or has been at any time prior to the date
          of this Agreement or who becomes prior to the Effective Time, an
          officer or director of the Company (each, an "Executive"),
          against all losses, expenses, damages, liabilities, costs,
          judgments, and amounts paid in settlement in connection with any
          claim, action, suit, proceeding, or investigation based on or
          arising out of, in whole or in part, any actions or omissions of
          such Executive as an officer or director of the Company on or
          prior to the Effective Time, including actions or omissions
          relating to any of the transactions contemplated by this
          Agreement, to the fullest extent permitted under the DGCL, the
          certificate of incorporation and bylaws of the Company and the
          Indemnification Agreements, a list of which has been provided to
          ICG.  ICG will cause the Surviving Corporation to pay expenses in
          advance of the final disposition of any such claim, action, suit,
          proceeding, or investigation to each Executive to the fullest
          extent permitted by applicable Legal Requirements upon receipt of
          any undertaking required or contemplated by applicable Legal
          Requirements.  Without limiting the foregoing, in any case in
          which approval of or a determination by the Surviving Corporation
          is required to effectuate any indemnification, (i) the Executives
          will conclusively be deemed to have met the applicable standards
          for indemnification with respect to any actions or omissions of
          such Executives as an officer or director of the Company on or
          prior to the Effective Time relating to any of the transactions
          contemplated by this Agreement and (ii) ICG shall cause the
          Surviving Corporation to direct, at the election of any
          Executive, that the determination of any such approval shall be
          made by independent counsel selected by the Executive and
          reasonably acceptable to ICG.  If any such claim, action, suit,
          proceeding, or investigation is brought against any Executive
          (whether arising before or after the Effective Time), (i) the
          Executive may retain counsel satisfactory to him or her that is
          reasonably acceptable, and (ii) ICG will pay or will cause the
          Surviving Corporation to pay all reasonable fees and expenses of
          such counsel for the Executive, as such fees and expenses are
          incurred, upon receipt of a written undertaking by the Executive
          that the Executive will repay the amounts so paid if it
          ultimately is determined in a final non-appealable judgment by a
          court of competent jurisdiction that he is not entitled to be
          indemnified by the Surviving Corporation as authorized by the
          DGCL.  Neither ICG nor the Surviving Corporation shall have any
          obligation hereunder to any Executive when and if a court of
          competent jurisdiction shall ultimately determine in a final non-
          appealable judgment that such Executive is not entitled to
          indemnification hereunder.

                    (b)  The Surviving Corporation shall maintain in effect
          for a period of one year after the Effective Time the policy of
          officers' and directors' liability insurance maintained by the
          Company on the date of this Agreement, with coverage in amount
          and scope at least as favorable as the Company's existing
          directors' and officers' liability insurance coverage; provided
          that such policy shall not be required to be maintained if
          equivalent coverage is provided to such Persons under another
          policy of officers' and directors' liability insurance maintained
          by ICG or any of its Affiliates; and provided further that in
          satisfying the obligations under this provision, the Surviving
          Corporation shall not be obligated to pay annual premiums in
          excess of 200% of the amount per annum paid by the Company in its
          last full fiscal year.  The amount per annum of premiums paid by
          the Company in its last full fiscal year equaled $426,500.

                    (c)  Successors.  If  ICG or the  Surviving Corporation
                         ----------
          or any of its successors or assigns (i) consolidates with or
          merges into any other Person and will not be the continuing or
          surviving Person of such consolidation or merger or (ii)
          transfers all or substantially all of its properties and assets
          to any Person, then and in each such case, proper provisions will
          be made so that the successors and assigns of ICG or the
          Surviving Corporation assume the obligations set forth in this
          Section 7.9.

                    Section 7.10   Employee Benefits.  For a period of at 
                                   -----------------
          least one year after the Effective Time, ICG will cause the
          Surviving Corporation to make generally available to the
          employees of the Company employee benefits, including severance
          benefits and accrued vacation time, which are no less favorable
          than those currently afforded to the employees of the Company. 
          On the Effective Date, the Company's employee stock purchase plan
          shall be terminated and any cash in participants' accounts will
          be refunded to them.


                                     ARTICLE VIII
                                     ------------

                                 CONDITIONS PRECEDENT

                    Section 8.1    Conditions to Each Party's Obligation to
                                   ----------------------------------------
          Effect the Merger.  The respective obligations of each party to
          -----------------   
          effect the Merger will be subject to the fulfillment at or prior
          to the Effective Time of the following conditions:

                    (a)  This Agreement, the Merger and the transactions
          contemplated by this Agreement shall have been duly approved, to
          the extent required by applicable law or rule by (i) the holders
          of the outstanding Company Stock entitled to vote, (ii) the
          holders of the outstanding ICG Common Stock entitled to vote, and
          (iii) ICG as the sole stockholder of Acquisition Sub.

                    (b)  The waiting period applicable to the consummation
          of the Merger under the HSR Act shall have expired or been
          earlier terminated.

                    (c)  The Registration Statement on Form S-4 that
          includes the Joint Proxy Statement/Prospectus shall have become
          effective in accordance with the provisions of the Securities Act
          and any necessary state securities law approvals shall have been
          obtained and no stop orders with respect thereto shall have been
          issued by the SEC and remain in effect.

                    (d)  No Governmental Entity shall have enacted, issued,
          promulgated, enforced or entered any Legal Requirement that
          remains in effect and has the effect of making the transactions
          contemplated by this Agreement illegal or otherwise prohibiting
          the transactions contemplated by this Agreement, or that
          questions the validity or the legality of the transactions
          contemplated by this Agreement and that could reasonably be
          expected to materially and adversely affect the value of the
          business of the Company, it being agreed that each party will use
          its reasonable best efforts to have any such injunction lifted. 
          All material consents of Governmental Entities required to be
          obtained with respect to the Merger and the other transactions
          contemplated by this Agreement shall have been obtained.

                    (e)  As of the Effective Time, the shares of ICG Common
          Stock issued in connection with the Merger will be quoted on
          NASDAQ, subject to satisfaction, in each case, of applicable
          NASDAQ requirements upon official notice of issuance.

                    Section 8.2    Conditions to Obligation of the Company
                                   ---------------------------------------
          to Effect the Merger.  The obligation of the Company to effect 
          --------------------
          the Merger will be subject to the fulfillment at or prior to the
          Effective Time of the additional following conditions:

                    (a)  The representations and warranties of ICG
          contained in this Agreement shall be true and correct in all
          material respects as of the Effective Time, with the same force
          and effect as if made as of the Effective Time, except (i) for
          changes contemplated by this Agreement, (ii) for those
          representations and warranties which address matters only as of a
          particular date (which shall remain true and correct as of such
          date), and (iii) in all such cases, for such breaches or
          inaccuracies of such representations and warranties as do not
          have a Material Adverse Effect on ICG, and the Company shall have
          received a certificate of ICG to such effect signed by the Chief
          Executive Officer of ICG.  For purposes of determining whether
          there has been a failure to satisfy the condition set forth in
          this Section 8.2(a), there shall not be considered any change in
          the stock price of capital stock of ICG after the date of this
          Agreement.

                    (b)  ICG shall have performed or complied in all
          material respects with all material agreements and covenants
          required by this Agreement to be performed or complied with by it
          prior to the Effective Time, and the Company shall have received
          a certificate of ICG to such effect signed by the Chief Executive
          Officer of ICG.

                    (c)  David W. Garrison shall have been appointed to the
          Board of Directors of ICG effective as of the Effective Time.

                    (d)  The opinion of BT Alex. Brown referenced in
          Section 5.4 shall not have been withdrawn.

                    (e)  The Company shall have received a written opinion
          of Pillsbury Madison & Sutro LLP, or other evidence, in form and 
          substance reasonably satisfactory to the Company, to the effect
          that the Merger will constitute a reorganization within the
          meaning of Section 368 of the Code.  In rendering such opinion,
          counsel may rely upon representations of the parties contained
          herein and in certificates of officers of the Company and others.

                    Section 8.3    Conditions to Obligations of ICG and
                                   ------------------------------------
          Acquisition Sub to Effect the Merger.  The obligations of ICG and
          ------------------------------------
          Acquisition Sub to effect the Merger will be subject to the
          fulfillment at or prior to the Effective Time of the additional
          following conditions:

                    (a)  The representations and warranties of the Company
          contained in this Agreement shall be true and correct in all
          material respects as of the Effective Time, with the same force
          and effect as if made as of the Effective Time, except (i) for
          changes contemplated by this Agreement, (ii) for those
          representations and warranties which address matters only as of a
          particular date (which shall remain true and correct as of such
          date), and (iii) in all such cases, for such breaches or
          inaccuracies of such representations and warranties as do not
          have a Material Adverse Effect on the Company, and ICG shall have
          received a certificate of the Company to such effect signed by
          the Chief Executive Officer of the Company.  For purposes of
          determining whether there has been a failure to satisfy the
          condition set forth in this Section 8.3(a), there shall not be
          considered any change in the stock price or capital stock of the
          Company after the date of this Agreement.

                    (b)  The Company shall have performed or complied in
          all material respects with all material agreements and covenants
          required by this Agreement to be performed or complied with by it
          on or prior to the Effective Time, and ICG shall have received a
          certificate of the Company to such effect signed by the Chief
          Executive Officer of the Company.

                    (c)  The opinion of Gleacher NatWest, Inc. referenced 
          in Section 4.4 shall not have been withdrawn. 

                    (d)  Prior to the Effective Time, the Company shall
          have disposed of all of its interest in Internetcom do Brazil,
          S.A. or, alternatively, shall have acquired, and holds as of the
          Effective Time, more than 51 percent of the equity interests of
          such company.

                                      ARTICLE IX
                                      ----------

                          TERMINATION, AMENDMENT AND WAIVER

                    Section 9.1    Termination.  This Agreement may be 
                                   -----------
          terminated at any time prior to the Effective Time, whether
          before or after approval by the stockholders of the Company or
          ICG:

                    (a)  by mutual written consent of the Board of
          Directors of ICG and the Board of Directors of the Company;

                    (b)  by either ICG or the Company (i) if at the Meeting
          of its stockholders (including any postponement or adjournment
          thereof), the Merger is not approved and adopted by the
          affirmative vote specified herein, (ii) after March 1, 1998 or
          (iii) if its independent accountants advise it in writing that
          the Merger will not qualify for pooling-of-interests accounting
          treatment under GAAP;

                    (c)        by the Company, if it receives notice from
          ICG of the determination of the Board of Directors of ICG as
          provided in Section 6.2(d);

                    (d)  by ICG, if it receives notice from the Company of
          the determination of the Board of Directors of the Company as
          provided in Section 6.1(i);

                    (e)  by ICG, if any Person (other than ICG and any of
          its Affiliates) shall have acquired before the Effective Time or
          the termination of this Agreement 50 percent or more of the
          outstanding Company Stock, unless such Person shall have
          delivered to ICG within two Business Days of such acquisition
          definitive written confirmation to the effect that such Person
          will vote in favor of the Merger at the Meeting and take no
          action to prevent or delay the Merger.

                    Section 9.2    Remedies.
                                   --------

                    (a)  In the event of the termination of this Agreement
          or breach of any provision of this Agreement by either ICG or the
          Company, ICG and the Company shall be entitled to all remedies
          available at law, provided that, subject to the specific
          performance remedy in the succeeding sentence, the remedies
          specified in Section 9.2(b) and Section 9.2(c) shall be the sole
          remedies allowable to ICG or the Company, as the case may be, as
          a result of the events specified therein.  Notwithstanding
          anything to the contrary in this Agreement, in the event of a
          breach of any provision of this Agreement prior to the
          termination of this Agreement, the non-breaching party shall be
          entitled to all available equitable remedies.

                    (b)  Subject to Section 9.2(d), if (i)(w) ICG receives
          notice from the Company of the determination of the Board of
          Directors of the Company as provided in Section 6.1(i), (x) the
          Board of Directors of the Company fails to recommend to the
          stockholders of the Company the approval of the Merger prior to
          March 2, 1998, or withdraws such recommendation, (y) the Merger
          is not consummated as a direct result of the failure of the
          Company to obtain stockholder approval as provided in Section
          8.1(a)(i) or (z) the condition set forth in Section 8.2(d) fails
          to be satisfied, and the giving of such notice or such failure or
          withdrawal is not the result of the failure of ICG to satisfy the
          conditions set forth in Section 8.2(a) or Section 8.2(b), (ii)
          any Person (other than ICG and any of its Affiliates) shall have
          acquired before the Effective Time or the termination of this
          Agreement 50 percent or more outstanding Company Stock and such
          Person fails to timely deliver the written confirmation to ICG as
          provided in Section 9.1(e), or (iii) if the Company fails to
          satisfy the conditions set forth in either Section 8.3(a) or
          Section 8.3(b) and in the case of Section 8.3(b) such failure
          prevented the consummation of the Merger prior to March 2, 1998,
          the Company will promptly pay to ICG by wire transfer, in
          immediately available funds, the Termination Fee.

                    (c)  Subject to Section 9.2(d), if (i)(w) the Company
          receives notice from ICG of the determination of the Board of  
          Directors of ICG as provided in Section 6.2(d), (x) the Board of
          Directors of ICG fails to recommend to the stockholders of ICG
          the approval of the Merger prior to March 2, 1998, or withdraws
          such recommendation, (y) if the Merger is not consummated as a
          direct result of the failure of ICG to obtain stockholder
          approval as provided in Section 8.1(a)(ii) or (z) the condition
          set forth in Section 8.3(c) fails to be satisfied, and the giving
          of such notice or such failure or withdrawal is not the result of
          the failure of the Company to satisfy the conditions set forth in
          Section 8.3(a) or Section 8.3(b), or (ii) if ICG fails to satisfy
          the conditions set forth in either Section 8.2(a) or Section
          8.2(b) and in the case of Section 8.2(b) such failure prevented
          the consummation of the Merger prior to March 2, 1998, ICG shall
          promptly pay to the Company by wire transfer, in immediately
          available funds, the Termination Fee.

                    (d)  Notwithstanding anything to the contrary herein,
          no party shall have any liability under the Agreement, including
          Section 9.2(a), Section 9.2(b) or Section 9.2(c), in the event
          the Agreement is terminated or terminable as a consequence of the
          nonfulfillment of any of the conditions set forth in Section
          8.1(b), Section 8.1(c), Section 8.1(d), Section 8.1(e), Section
          8.2(c) or Section 8.2(e), unless such nonfulfillment is caused by
          that party's material breach of any of its covenants or
          obligations under this Agreement. 

                    (e)  If the Company or ICG terminates the Agreement as
          a consequence of any failure to satisfy the conditions set forth
          in Section 8.2(a) or Section 8.3(a), for purposes of determining
          whether payment of the Termination Fee under Section 9.2(b) or
          Section 9.2(c) is required, the party so terminating the
          Agreement on that basis shall bear the burden of proof of
          demonstrating by clear and convincing evidence that such failure
          occurred and in so doing may not introduce into evidence, nor may
          a court consider in its deliberation, any change in the stock
          price of the capital stock of either party whether or not such
          change is in conjunction with or otherwise relates to the event
          giving rise to the breach or otherwise. 

                    Section 9.3    Amendment.  This Agreement may be 
                                   ---------
          amended by ICG and the Company by or pursuant to action taken by
          their respective Boards of Directors at any time before or after
          approval of this Agreement by the stockholders of the Company and
          ICG and prior to the Effective Time, but, after either such
          approval, no amendment will be made that changes the Exchange
          Ratio as provided in Section 3.1 or changes, in any way adverse
          to such stockholders, the terms of the ICG Common Stock or that
          in any other way materially adversely affects the rights of such
          stockholders, without the further approval of such stockholders. 
          This Agreement may not be amended except by an instrument in
          writing signed on behalf of ICG and the Company.

                    Section 9.4    Waiver.  At any time prior to the 
                                   ------
          Effective Time, subject to Section 9.3, ICG and the Company, by
          or pursuant to action taken by their respective Boards of
          Directors, may (i) extend the time for performance of any of the
          obligations or other acts of the other party to this Agreement, 
          (ii) waive any inaccuracies in the representations and warranties
          set forth in this Agreement or in any documents delivered
          pursuant to this Agreement and (iii) waive compliance with any of
          the agreements or conditions set forth in this Agreement.  Any
          agreement on the part of a party to this Agreement to any such
          extension or waiver will be valid if set forth in an instrument
          in writing signed on behalf of such party.

                                      ARTICLE X
                                      ---------

                           GENERAL PROVISIONS; DEFINITIONS

                    Section 10.1   Non-Survival of Representations,
                                   --------------------------------
          Warranties and Agreements.  No representations and warranties 
          -------------------------
          contained in this Agreement will survive beyond the Closing Date. 
          This Section 10.1 will not limit any covenant or agreement of the
          parties to this Agreement that by its terms requires performance
          after the Closing Date.

                    Section 10.2   Notices.  All notices or other 
                                   -------
          communications under this Agreement will be in writing and will
          be given (and will be deemed to have been duly given upon
          receipt) by delivery in person, by cable, telegram, telex or
          other standard form of telecommunications, or by registered or
          certified mail, postage prepaid, return receipt requested,
          addressed as follows:

                    If to the Company:  NETCOM On-Line Communication
                                        Services, Inc.
                                        Two North Second Street, Plaza A
                                        San Jose, California  95113
                                        Attention:  David W. Garrison, Chief
                                                    Executive Officer and
                                                    Chairman of the Board
                                        Telecopy No.: 408-881-3430

                    With a copy to:     Pillsbury, Madison & Sutro LLP
                                        2700 Sand Hill Road
                                        Menlo Park, California  94028
                                        Attention:  Jorge A. Del Calvo
                                        Telecopy No.:  415-233-4545

                    If to ICG:          ICG Communications, Inc.

                                        9605 East Maroon Circle
                                        Englewood, Colorado  80112
                                        Attention:  J. Shelby Bryan,
                                                    President and Chief
                                                    Executive Officer and 
                                                    H. Don Teague, General
                                                    Counsel
                                        Telecopy No.:  303-575-6278

                    With a copy to:     Sherman & Howard L.L.C.

                                        633 Seventeenth Street
                                        Suite 3000
                                        Denver, Colorado  80202
                                        Attention: Robert Mintz, Esq.
                                        Telecopy No.:  303-298-0940

          or to such other addresses as any party may have furnished to the
          other parties in writing in accordance with this Section 10.2.

                    Section 10.3   Fees and Expenses.  Except as provided
                                   -----------------
          in Section 9.2, whether or not the Merger is consummated, all
          costs and expenses incurred in connection with this Agreement and
          the transactions contemplated by this Agreement will be paid by
          the party incurring such expenses.

                    Section 10.4   Specific Performance.  The parties to 
                                   --------------------
          this Agreement agree that irreparable damage would occur in the
          event that any of the provisions of this Agreement were not
          performed in accordance with their specific terms or were
          otherwise breached.  It is accordingly agreed that, in accordance
          with Section 9.2(a), the parties will be entitled to enforce
          specifically the terms and provisions of this Agreement in any
          court of the United States or any state having jurisdiction, this
          being in addition to any other remedy to which they are entitled
          at law or in equity, and no party will raise any defense to the
          institution of such equitable relief.

                    Section 10.5   Third Party Beneficiaries.  The parties
                                   -------------------------
          to this Agreement agree that the Company's stockholders,
          officers, directors and employees are intended third party
          beneficiaries of the terms of this Agreement, to the extent such
          terms refer expressly to such Persons, with full rights hereunder
          as if each of them were a party to this Agreement.

                    Section 10.6   Entire Agreement; Miscellaneous.  This 
                                   -------------------------------
          Agreement will be of no force or effect until executed and
          delivered by all of the parties to this Agreement. This Agreement
          (including the documents and instruments referred to in this
          Agreement) when executed and delivered, constitutes the entire
          agreement and supersedes all other prior agreements and
          understandings, both written and oral, among the parties, or any
          of them, with respect to the subject matter of this Agreement. 
          This Agreement may be executed in two or more counterparts which
          together will constitute a single agreement.  This Agreement may
          be delivered by facsimile.  Any certificate delivered pursuant to
          this Agreement will be made without personal liability on the
          part of the officer or employee of the Person giving such
          certificate.

                    Section 10.7   Governing Law and Venue; Waiver of Jury
                                   ---------------------------------------
                                   Trial.
                                   -----

                         (a)  THIS AGREEMENT SHALL BE DEEMED TO BE MADE
          UNDER, AND IN ALL RESPECTS SHALL BE INTERPRETED, CONSTRUED AND
          GOVERNED BY AND IN ACCORDANCE WITH, THE LAW OF THE STATE OF
          DELAWARE.  The parties hereby irrevocably submit to the
          jurisdiction of the courts of the State of Delaware and the
          Federal courts of the United States of America located in the
          State of Delaware solely in respect of the interpretation and
          enforcement of the provisions of this Agreement and of the
          documents referred to in this Agreement, and in respect of the
          transactions contemplated hereby, and hereby waive, and agree not
          to assert, as a defense in any action, suit or proceeding for the
          interpretation or enforcement hereof or of any such document,
          that it is not subject thereto or that such action, suit or
          proceeding may not be brought or is not maintainable in said
          courts or that the venue thereof may not be appropriate or that
          this Agreement or any such document may not be enforced in or by
          such courts, and the parties hereto irrevocably agree that all
          claims with respect to such action or proceeding shall be heard
          and determined in such a Delaware State or Federal court.  The
          parties hereby consent to and grant any such court jurisdiction  
          over the person of such parties and over the subject matter of
          such dispute and agree that mailing of process or other papers in
          connection with any such action or proceeding in the manner
          provided in Section 10.2 or in such other manner as may be
          permitted by law shall be valid and sufficient service thereof.

                         (b)  EACH PARTY ACKNOWLEDGES AND AGREES THAT ANY
          CONTROVERSY WHICH MAY ARISE UNDER THIS AGREEMENT IS LIKELY TO
          INVOLVE COMPLICATED AND DIFFICULT ISSUES, AND THEREFORE EACH SUCH
          PARTY HEREBY IRREVOCABLY AND UNCONDITIONALLY WAIVES ANY RIGHT
          SUCH PARTY MAY HAVE TO A TRIAL BY JURY IN RESPECT OF ANY
          LITIGATION DIRECTLY OR INDIRECTLY ARISING OUT OF OR RELATING TO
          THIS AGREEMENT, OR THE TRANSACTIONS CONTEMPLATED BY THIS
          AGREEMENT.  EACH PARTY CERTIFIES AND ACKNOWLEDGES THAT (i) NO
          REPRESENTATIVE, AGENT OR ATTORNEY OF ANY OTHER PARTY HAS
          REPRESENTED, EXPRESSLY OR OTHERWISE, THAT SUCH OTHER PARTY WOULD
          NOT, IN THE EVENT OF LITIGATION, SEEK TO ENFORCE THE FOREGOING
          WAIVER, (ii) EACH PARTY UNDERSTANDS AND HAS CONSIDERED THE
          IMPLICATIONS OF THIS WAIVER, (iii) EACH PARTY MAKES THIS WAIVER
          VOLUNTARILY, AND (iv) EACH PARTY HAS BEEN INDUCED TO ENTER INTO
          THIS AGREEMENT BY, AMONG OTHER THINGS, THE MUTUAL WAIVERS AND
          CERTIFICATIONS IN THIS SECTION 10.7.


                              [SIGNATURES ON NEXT PAGE]




     


                    IN WITNESS WHEREOF, the parties have caused this
          Agreement to be signed by their respective officers thereunder
          duly authorized all as of the date first written above.


                                   ICG COMMUNICATIONS, INC.



                                   By: /s/ J. Shelby Bryan
                                       -----------------------------------
                                       Name:    J. Shelby Bryan
                                       Title:   President and Chief
                                                Executive Officer



                                      NETCOM ON-LINE COMMUNICATION
                                      SERVICES, INC.



                                      By:   /s/  David W. Garrison
                                            -------------------------------
                                          Name:   David W. Garrison
                                          Title:  Chief Executive Officer
                                                   and Chairman of the
                                                   Board


     


                                     Exhibit A
                                  to Agreement and
                                   Plan of Merger


                             FORM OF AFFILIATE AGREEMENT


          Gentlemen:

               The undersigned is a holder of shares of Common Stock, par
          value $0.01 per share ("Common Stock"), of NETCOM On-Line
          Communication Services, Inc., a Delaware corporation ("NETCOM"),
          and will be entitled to receive in connection with the merger
          (the "Merger") of a wholly-owned Delaware subsidiary of ICG
          Communications, Inc., a Delaware corporation ("ICG"), with and
          into NETCOM, shares of Common Stock, par value $0.01 per share,
          of ICG (the "Securities").

               The undersigned acknowledges that the undersigned may be
          deemed an "affiliate" of NETCOM within the meaning of Rule 145
          ("Rule 145") promulgated under the Securities Act of 1933, as
          amended (the "Act"), and/or as such term is used in and for
          purposes of Accounting Series Releases 130 and 135, as amended,
          of the Securities and Exchange Commission (the "Commission"),
          although nothing contained herein shall be construed as an
          admission of such status.

               If in fact the undersigned were an affiliate of NETCOM under
          the Act, the undersigned's ability to sell, assign or transfer
          any Securities received by the undersigned in exchange for any
          shares of NETCOM pursuant to the Merger may be restricted unless
          such transaction is registered under the Act or an exemption from
          such registration is available.  The undersigned understands that
          such exemptions are limited and the undersigned has obtained
          advice of counsel as to the nature and conditions of such
          exemptions, including instruction with respect to the
          applicability to the sale of such Securities of Rules 144 and
          145(d) promulgated under the Act.

               The undersigned hereby represents to and covenants to ICG
          that the undersigned will not sell, assign or transfer any
          Securities received by the undersigned in exchange for shares of
          Common Stock pursuant to the Merger except (i) pursuant to an
          effective registration statement under the Act, (ii) by a
          transaction in conformity with the volume and other limitations
          of Rule 145 or Rule 144 under the Act ("Rule 144"), to the extent
          applicable, or any other applicable rules promulgated by the
          Commission or (iii) in a transaction which, in the opinion of
          independent counsel reasonably satisfactory to ICG, or as
          described in a "no-action" or interpretative letter from the
          Staff of the Commission, is not required to be registered under
          the Act.

               In the event of a sale of Securities pursuant to Rule 145,
          or, if applicable, Rule 144, the undersigned will supply ICG with
          evidence of compliance with such Rule, in the form of customary
          seller's and broker's Rule 145 or, if applicable, Rule 144,
          representation letters or as ICG may otherwise reasonably
          request.  The undersigned understands that ICG may instruct its
          transfer agent to withhold the transfer of any Securities
          disposed of by the undersigned in a manner inconsistent with this
          letter. 

               The undersigned acknowledges and agrees that appropriate
          legends will be placed on certificates representing Securities
          received by the undersigned in the Merger or held by a transferee
          thereof, which legends will be removed (i) by delivery of
          substitute certificates upon receipt of an opinion in form and
          substance reasonably satisfactory to ICG to the effect that such
          legends are no longer required for the purposes of the Act and
          the rules and regulations of the Commission promulgated
          thereunder or (ii) in the event of a sale of the Securities which
          has been registered under the Act.

               The undersigned further represents to, and covenants with
          NETCOM and ICG that the undersigned will not, during the period
          beginning on the date that ICG gives written notice that
          consummation of the Merger is reasonably expected to occur within
          sixty days of the date of such notice, sell, transfer or
          otherwise dispose of, or reduce any risk relative to, the
          Securities received by the undersigned in the Merger or any other
          shares of the capital stock of ICG until after such time as
          results covering at least 30 days of operations of ICG (including
          the combined operations of NETCOM) have been published by ICG in
          the form of a quarterly earnings report, or an annual report on
          Form 10-K, if such 30-day period includes the end of ICG's fiscal
          year, an effective registration statement filed with the
          Commission, a report to the Commission on Form 10-K, 10-Q, or 8-
          K, or any other public filing or announcement which includes such
          results of operations.

               The undersigned acknowledges that it has carefully reviewed
          this letter and understands the requirements hereof and the
          limitations imposed upon the distribution, sale, transfer or
          other disposition of Securities.

                                   Very truly yours,



                                   --------------------------------------
                                   [Name]
                                   [Address]


          Dated:  October   , 1997
                          --





               As an inducement to the above individual to deliver this
          letter, ICG agrees that for so long and to the extent necessary
          to permit such individual to sell the Securities pursuant to Rule
          145 and, to the extent applicable, Rule 144 under the Act, ICG
          shall use all reasonable efforts to file, on a timely basis, all
          reports and data required to be filed by it with the Commission
          pursuant to Section 13 of the Securities and Exchange Act of
          1934.

                                   Very truly yours,

                                   ICG COMMUNICATIONS, INC.


                                   By: 
                                       -----------------------------------
                                        Name: 
                                              -----------------------------
                                        Title: 
                                              ----------------------------