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                                                                   Exhibit 10.10

AGREEMENT BETWEEN MICROSOFT AND PROGRESSIVE NETWORKS ON MEDIA STREAMING
TECHNOLOGY


This "Agreement" is entered into and effective as of June 17, 1997 (the
"Effective Date") by and between MICROSOFT CORPORATION, a Washington
corporation located at One Microsoft Way, Redmond, WA 98052 ("Microsoft") and
PROGRESSIVE NETWORKS, INC., a Washington corporation located at 1111 Third
Avenue, Suite 2900, Seattle, WA 98101 ("PN").

1.       DEFINITIONS

1.1      "Standard Code" means all of the PN and third party code (subject to
         Section 2.2) used in PN's current version 4.0 streaming audio and video
         client and server products, including, but not limited to, PN Internal
         Tools, tools currently provided to third parties at no charge by PN [*]
         and including bug-fixes developed by PN during the one year following
         delivery by PN, for all operating system platforms, including but not
         limited to all versions of Microsoft Windows, all versions of UNIX, the
         Macintosh operating system, and the WebTV operating system.  Standard
         Code shall not include code PN's "Splitter" products or its Player Plus
         software, nor shall it include future-developed technology for
         advertisement insertion, datatypes other than audio or video (which are
         not included in PN Clients or RA/RV Server), distributed networking
         (such as Splitter finding), tools which are value-add technology on top
         of base level encoders, billing and other value added technology
         (technology which is not required for Compatibility purposes).  It is
         expressly understood that base level encoding and compression
         technology is part of the Standard Code; further, thinning and
         bandwidth negotiation are part of the Standard Code to the extent such
         technologies are used in PN's current version 4.0 streaming audio and
         video client and server products.  Standard Code does not include added
         PN or third party hardware or software technology bundled with Standard
         Code as part of short term sales promotions.

1.2      "Internal Tools" means associated documentation, specifications, and
         tools developed by either party, necessary to build and create
         derivative works of the code.

1.3      [*]

1.4      "Term" means the three (3) year period commencing upon the Effective
         Date.

1.5      "Confidential Information" means: (i) any trade secrets relating to
         either party's product or service plans, designs, costs, prices and
         names, finances, marketing plans, business opportunities, personnel,
         research, development or know-how; and (ii) the specific terms and
         conditions of this Agreement.  "Confidential Information" shall not
         include information that: (i) is or becomes generally known or
         available, whether by publication, commercial use or otherwise,
         without restriction on disclosure and through no fault of the
         receiving party; (ii) is known and has been reduced to tangible form
         by the receiving party at the time of disclosure and is not subject to
         restriction; (iii) is independently developed or learned by the
         receiving party without reference to any Confidential Information of
         the disclosing party; and (iv) is lawfully obtained from a third party
         that has the right to make such disclosure.

1.6      "PN Clients" means PN's RealAudio and RealVideo standard player,
         versions 4.0.

1.7      "RA/RV Server" means PN's Easy Start RealAudio/RealVideo server
         software version 4.0, with 60 user stream capability.





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1.9      "Compatible" means audio/video client or server streaming software
         which interoperates with the PN Clients or the RA/RV Server (including
         current versions of the PN Clients and the RA/RV Server as of the date
         of a subsequent delivery of Standard Code), respectively, or as the
         parties may otherwise mutually agree.  For purposes of this Agreement
         "interoperates" means the clients and servers of both parties will
         operate substantially as well with PN Clients and RA/RV Server
         (including current versions of the PN Clients and the RA/RV Server as
         of the date of a subsequent delivery of Standard Code) as with its own
         products.

2.       LICENSE GRANTS

2.1      Non-Exclusive License to Standard Code. PN hereby grants to Microsoft
         a non-exclusive, perpetual, [*] worldwide, fully paid-up right and
         license to: (i) [*] (ii) reproduce, license, rent, lease, broadcast
         publicly display, transmit or otherwise distribute in any medium now 
         known or hereafter devised (collectively, "Distribute") and have 
         Distributed, to and by third parties, binary versions of the Standard 
         Code [*]

         The foregoing license grants include a license under any current and
         future patents owned or licensable by PN to the extent necessary: (i) 
         to exercise any license right granted herein; and (ii) to combine the 
         Standard Code and/or derivative works thereof with any hardware and 
         software.

2.2      [*]

2.3      Non-Exclusive License to PN Trademarks.  PN hereby grants to Microsoft
         a non-exclusive, perpetual, irrevocable, worldwide, fully paid- up
         right and license to use and sublicense the use of any "PN Marks" for
         identification of, or in conjunction with, or as part of Microsoft
         products which are








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         Compatible.  For purposes of this Section 2.3, "PN Marks" means PN
         trademarks and related logos for "Real Audio" and "Real Video."  If
         Microsoft exercises its rights under Section 3.3, the PN Marks will
         also include those marks and associated logos which are used in
         connection with the applicable versions of the Compatible PN Clients
         and RA/RV Server.

         PN agrees that it will license use of the PN Marks to third parties
         only for use with products that are Compatible.  Microsoft may only
         sublicense the PN Marks for use in connection with third party
         products which are Compatible, and which comply with the PN quality
         control guidelines imposed on Microsoft under this Agreement.
         Microsoft will use good faith efforts to ensure that its sublicensees
         abide by PN's quality control guidelines, and will cooperate with PN
         to remedy any violation thereof by its sublicensees.

         Microsoft agrees that it will comply with PN's trademark usage
         guidelines regarding the style and design of the PN Marks, which PN
         will deliver to Microsoft within two (2) weeks of the Effective Date.
         Microsoft agrees to cooperate with PN in facilitating PN's reasonable
         monitoring and review of the nature and quality of products and
         services bearing the PN Marks, and to supply PN with specimens of
         Microsoft's use of the PN Marks upon reasonable request Microsoft
         understands and agrees that the use of any PN Mark in connection with
         this Agreement shall not create any right, title or interest in or to
         the use of the PN Marks and that all such use and goodwill associated
         with the PN Marks will inure to the benefit of PN.  [*]

2.4      [*]




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         [*]

2.5      Distribution of RA/RV Server.  Until Microsoft distributes a
         Compatible server product, Microsoft shall distribute the RA/RV Server
         [*] Microsoft's website shall provide cross-links to PN's website for 
         additional information and support of the RA/RV Server. PN shall be 
         solely responsible for RA/RV Server end user support and shall have 
         the discretion to create appropriate support policies for end user 
         support.

2.6      [*]

2.7      Support.  During the Term, each party shall use commercially practical
         efforts to:

         (a)     [*]

         (b)     Provide consistent points of contact at the program manager
                 and executive level; and

         (c)     Provide each other reasonable level of technical support.

         PN will receive such information at such quarterly meetings and to the
         same extent provided to Microsoft's own internal streaming media
         operations.





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3.       LICENSE FEE; DELIVERY; CONSULTING

3.1      Initial Delivery.  On a date within thirty (30) days of signing this
         agreement, such date to be set by Microsoft at its sole discretion, PN
         shall make delivery to Microsoft of the Standard Code.  At that time,
         PN shall deliver to Microsoft PN's latest version of the Standard
         Code, including any and all works in progress whether or not such
         works have been released by PN.  PN shall also provide Microsoft with
         six (6) man-months of free consulting help by knowledgeable PN
         employee's to train Microsoft with respect to the Standard Code,
         including but not limited to how to build and create derivative works
         of the Standard Code.

3.2      License Fee.  In consideration for the rights and licenses granted
         under this Agreement, Microsoft shall pay PN the sum of thirty millon
         dollars ($30,000,000).  Of this amount, twenty million dollars
         ($20,000,000) shall be paid [*] and ten million dollars ($10,000,000)
         shall be paid [*] 

3.3      [*]

3.4      Bug Fixes.  PN shall deliver any bug fixes to the Standard Code on a
         quarterly basis in the twelve (12) months following the initial [*]

3.5      UNIX Port.  Regardless of whether Microsoft exercises its rights to
         subsequent deliveries of Standard Code, PN shall deliver to Microsoft
         any UNIX port of Microsoft Code which PN makes which PN does not
         distribute or ceases to distribute.  Such UNIX port shall be
         considered licensed royalty-free to Microsoft under the terms of
         Section 2.1.

4.       PATENT ISSUES

4.1      Patent Covenant.  PN covenants not to (a) sue or (b) bring, prosecute,
         assist or participate in any judicial, administrative or other
         proceedings of any kind against Microsoft or its licensees (including
         but not limited to OEMs and other distributors) for infringement of PN
         Patents which occurs during the Immunity Period on account of the
         manufacture, use, sale, importation, promotion or distribution of any
         Microsoft audio and video client and server streaming functionality
         included in any Microsoft products and technology (except Foundry
         products and technology), regardless of whether such products and
         technology is marketed under a Microsoft trademark regardless of
         whether such products include Standard Code.  "PN Patents" as used in
         this Section 4.1 means (i) any and all patents (other than design
         patents or the equivalent), or the inventions, ideas or applications
         thereof, worldwide, whether currently existing, or later developed,
         applied for, issued prior to the Term, or issuing during





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         the Term, and under which patents (or the inventions, ideas or
         applications therefor) PN, or any of its Affiliates, now has or
         obtains during the Term, the ability or right to license or grant
         immunity from suit; and (ii) all extensions, divisionals,
         continuations, continuations-in-art, re-examinations and reissue
         patents of such patents, as well as patent applications thereof, to
         the extent rights attach to such applications.  The "Immunity Period"
         shall commence upon the first to issue and shall terminate upon the
         last to expire, of any of the PN Patents (in any jurisdiction).

         For purposes of this Section 4, "Foundry" means a product or
         technology manufactured, reproduced, sold, leased, licensed or
         otherwise transferred ("Transferred") by one party to this Agreement
         (the "Acting Party") to a third party, wherein the product or
         technology is (i) designed by or for a third Party without substantial
         input from the Acting Party and Transferred from the Acting Party to
         such third party or such third party's customers on an exclusive or
         substantially exclusive basis; or (ii) otherwise Transferred through
         or by the Acting Party for the purpose of circumventing any patent
         rights of the other Party to this Agreement.

4.2      Patent Covenant.  Microsoft covenants not to (a) sue or (b) bring,
         prosecute, assist or participate in any judicial administrative or
         other proceedings of any kind against PN or its licensees (including
         but not limited to OEMs and other distributors) for infringement of
         Microsoft Patents which occurs during the Immunity Period on account
         of the manufacture, use, sale, importation, promotion or distribution
         of any PN audio and video client and server streaming functionality
         included in any PN products and technology (except Foundry products
         and technology), regardless of whether such products and technology is
         marketed under a PN trademark regardless of whether such products
         include Microsoft Code.  "Microsoft Patents" as used in this Section
         4.2 means (i) any and all patents (other than design patents or the
         equivalent), or the inventions, ideas or applications thereof,
         worldwide, whether currently existing, or later developed, applied
         for, issued prior to the Term, or issuing during the Term and under
         which patents (or the inventions, ideas or applications therefor)
         Microsoft, or any of its Affiliates, now has or obtains during the
         Term, the ability or right to license or grant immunity from suit; and
         (ii) all extensions, divisionals, continuations, continuations-in-art
         re-examinations and reissue patents of such patents, as well as patent
         applications thereof, to the extent rights attach to such
         applications.  The "Immunity Period" shall commence upon the first to
         issue and shall terminate upon the last to expire, of any of the
         Microsoft Patents (in any jurisdiction).

4.3      [*]

4.4      Covenants Personal and Non-Assignable.  Each party agrees that the
         respective covenant granted to it in Section 4.1 or Section 4.2 is
         personal to it and may not be assigned, licensed or otherwise
         transferred by it in whole or in part, to any third party, whether
         under action of law or otherwise and including in connection with the
         insolvency or bankruptcy of such party.





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5.       MEDIA FILE FORMAT AGREEMENT

Microsoft and PN shall work in good faith and use best efforts to conclude,
within ten (10) business days, the agreement currently being negotiated to
align media file formats and client technology.


6.       [*]

6.1      [*]

6.2      [*]

6.3      [*]

7.       INVESTMENT

7.1      Non-Voting Preferred Stock.  PN agrees to sell to Microsoft, and
         Microsoft agrees to purchase from PN, three million, three hundred
         thirty-eight thousand, three hundred seventy-four (3,338,374) shares
         of non-voting preferred stock of PN at a per share price of eight
         dollars and ninety-nine cents ($8.99).  These shares are convertible
         into voting or non-voting common stock (at Microsoft's option) of PN.





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         These preferred shares will have terms and rights and preferences
         comparable to existing preferred shares of PN.

7.2      Warrant.  Simultaneously with the purchase of the preferred shares set
         forth in Section 7.1, PN will grant to Microsoft a warrant to purchase
         three million, seven hundred nine thousand, three hundred and five
         (3,709,305) shares of non-voting preferred stock of PN, convertible
         into voting or non-voting common stock (at Microsoft's option) of PN.
         The purchase price of each share under the warrant shall equal
         thirteen dollars and forty-eight cents ($13.48), subject to standard
         adjustments for stock splits, stock dividends, reclassifications or
         reorganizations.  The warrant shall have a term of two and one-half
         (2.5) years.  In the event of an initial public offering ("IPO") of
         PN, the warrant shall either be exercised by Microsoft on or before
         the date of the IPO or shall expire.

7.3      Board of Directors.  So long as Microsoft holds no less than (i)
         3,338,374 shares of preferred stock (or common stock issued upon the
         conversion of the preferred shares), or (ii) five percent (5%) of the
         fully-diluted shares of PN, Microsoft shall have the right in its sole
         discretion to have either (a) a Microsoft representative appointed to
         the PN Board of Directors, or (b) a Microsoft representative appointed
         as an observer to the PN Board of Directors.  PN shall have the right
         to approve such board member or observer, provided such approval shall
         not be unreasonably withheld or delayed.

7.4      Approvals.  Microsoft acknowledges that (i) PN's obligations under
         this Section 7 are conditioned upon receiving certain shareholder
         approvals and (ii) the warrant in Section 7.2 and all shares to be
         purchased by Microsoft pursuant to this Section 7 will not have been
         registered under the Securities Act of 1933, as amended, and therefore
         may be issued and sold only upon Microsoft making such representations
         and warranties as are customary in connection with the purchase of
         restricted stock.  Microsoft agrees to make such customary
         representations and warranties.  PN will use its reasonable best
         efforts to obtain any necessary shareholder approvals identified by
         this Section 7.4.  In the event PN is unable to obtain such
         shareholder approval(s) by 5 p.m., June 23, 1997, PN shall propose to
         Microsoft alternative terms which do not require shareholder approval.
         If Microsoft does not agree to such alternative terms, this Agreement
         shall terminate.  If Microsoft does agree to such alternative terms,
         then notwithstanding such agreement by Microsoft and if PN convinces
         its shareholders within twenty-five (25) days to accept the original
         transaction, then the original terms shall apply.  Absent such
         shareholder approval of the original terms, the alternative terms
         proposed by PN and agreed to by Microsoft shall be the basis of the
         Agreement.  Upon such termination, then notwithstanding anything to
         the contrary herein (including but not limited to Section 11.5), this
         Agreement shall terminate as though the parties never executed the
         Agreement.

7.5      Definitive Agreements.  Each party will use all reasonable efforts to
         negotiate and close on any and all necessary agreements and approvals
         required to perfect the investment set forth in this Section 7 within
         thirty (30) days of the Effective Date.

7.6      Due Diligence.  Microsoft's obligation to purchase preferred shares of
         PN is subject to the satisfactory completion of due diligence by
         Microsoft.  PN will make available to Microsoft documents and
         information as reasonably requested, so that Microsoft can perform a
         full investigation of PN's business and legal conditions.  Microsoft
         will complete its due diligence within seven (7) days of notification
         by PN that PN has collected and made available to Microsoft all the
         due diligence materials requested by Microsoft.

7.7      Regulatory Approval.  The parties acknowledge that a material
         consideration of this Agreement is the ability to implement and
         conclude the Agreement expeditiously.  If, by 5 p.m., June 23, 1997,
         either party, in its sole discretion, determines that any required
         government or regulatory approvals (solely with respect to this
         Agreement and not in combination with any other proposed or actual
         transaction) could cause unacceptable delay in successfully
         implementing and concluding the Agreement expeditiously, either party
         may terminate this Agreement.  Upon such termination, then
         notwithstanding anything to the contrary herein (including but not
         limited to Section 11.5), this Agreement shall terminate as though the
         parties never executed the Agreement.





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8.       CONFIDENTIALITY; ANNOUNCEMENTS

8.1      Announcement.  The parties will announce their relationship under this
         Agreement within thirty (30) days of the Effective Date.  The precise
         timing and content of any announcement of this Agreement must be
         jointly agreed upon, but both parties will acknowledge the nature of
         Microsoft's distribution of PN's technology, the fact of Microsoft's
         investment in PN, and other matters of strategic importance agreed to
         by the parties.  [*]  Upon such termination, then notwithstanding
         anything to the contrary herein (including but not limited to Section
         11.5), this Agreement shall terminate as though the parties never
         executed the Agreement.

8.2      Restrictions on Use and Disclosure.  Each party shall protect the
         other's Confidential Information from unauthorized dissemination and
         use with the same degree of care that such party uses to protect its
         own like information.  Neither party will use the other's Confidential
         Information for purposes other than those necessary to directly
         further the purposes of this Agreement.  Each party will use its best
         efforts not to disclose to third parties the other's Confidential
         Information without the prior written consent (except with respect to
         source code as set forth in Section 2.1) of the other party.  Except
         as expressly provided in this Agreement, no ownership or license
         rights are granted in any Confidential Information.

9.       [*]



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9.1      [*]

9.2      [*]




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10.      [*]

10.1     [*]

10.2     [*]

11.      TERMINATION

11.1     Term.  Unless earlier terminated in accordance with Section 11.2, this
         Agreement shall commence upon the Effective Date and continue in full
         force and effect through the Term.

11.2     Termination By Either Party For Cause.  Either party may suspend
         performance and/or terminate this Agreement immediately upon written
         notice at any time if the other party is in material breach of Section
         8.2 and fails to cure that breach within five (5) days after written
         notice thereof.

11.3     Dispute Resolution.  If the a party is in material breach of any
         material warranty, term, condition or covenant of this Agreement other
         than those contained in Section 8.2, such party shall cure that breach
         within forty-five (45) after written notice thereof.  If a party
         contests or disputes that material breach has so occurred, the parties
         shall submit any dispute to structured negotiation as follows:

         (a)     Coverage.  Other than actual or imminent material breaches of
                 Section 8.2, any dispute between the parties with respect to
                 this Agreement shall be submitted for structured negotiation.
                 The commencement, and any resolution reached as a result, of
                 any dispute resolution under Section 11.3 shall be considered
                 Confidential Information and protected under Section 8.

         (b)     Structured Negotiation.  Either party may invoke this
                 procedure by giving written notice to the other party
                 designating a corporate officer with appropriate authority to
                 be its representative in negotiations relating to the dispute.
                 Upon receipt of such notice, the other party shall, within
                 five (5) business days, designate a corporate officer with
                 similar authority to be its





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                 representative.  The designated officers shall, following
                 whatever investigation each deems appropriate, but no event
                 later than twenty (20) business days after the original
                 notice, enter into discussions concerning the dispute.  If
                 within an additional twenty (20) business days of their
                 initial meeting, the representatives do not resolve the
                 dispute, either party may submit the matter to binding
                 arbitration under Section 11.3(c).

         (c)     Binding Arbitration.  Any dispute not settled by the parties
                 by structured negotiation (other than actions for injunctive
                 relief including specific performance) shall be submitted only
                 to binding arbitration.  The arbitration will be conducted in
                 accordance with the procedures in this document and the
                 Arbitration Rides for Commercial Arbitration Rules of the AAA
                 ("AAA Rules").  In the event of a conflict with such rules,
                 the provisions of this Agreement will control.

                 The arbitration shall take place in Seattle, Washington,
                 before a panel of three arbitrators appointed as follows:
                 each party shall select a single arbitrator, and the two (2)
                 selected arbitrators shall mutually agree upon a third.  The
                 arbitrators selected shall have knowledge and experience in
                 the computer software business.  The arbitrators shall rule on
                 the dispute by issuing a written opinion setting forth
                 findings of fact and the rationale for their decision within
                 thirty (30) days after the close of hearings.  The decision
                 rendered by the arbitrators shall be final and binding and may
                 be entered as a judgment in any court of competent
                 jurisdiction.  The arbitrator(s) shall control the scheduling
                 so as to process the matter expeditiously.  The times
                 specified in this section may be extended upon mutual
                 agreement of the parties by the arbitrators upon a showing of
                 good cause.

                 Any issue concerning the extent to which any dispute is
                 subject to arbitration, or concerning the applicability,
                 interpretation or enforceability of these procedures,
                 including any contention that all or part of these procedures
                 are invalid or unenforceable, shall be governed by the Federal
                 Arbitration Act and resolved by the arbitrators.  No potential
                 arbitrator may serve on the panel unless he or she has agreed
                 in writing to abide and be bound by these procedures.

                 All aspects of the arbitration shall be treated as
                 Confidential Information.

                 Unless provided otherwise in the Agreement, the arbitrators
                 may not award non-monetary or equitable relief of any sort.
                 They will have no power to award damages inconsistent with the
                 Agreement.  In no event, even if any other portion of these
                 provisions is held to be invalid or unenforceable, shall the
                 arbitrators have power to make an award or impose a remedy
                 that could not be made or imposed by a court deciding the
                 matter in the same jurisdiction.

                 The parties may submit written briefs.  Discovery shall be
                 controlled by the arbitrators and shall be permitted as
                 follows: each party may submit in writing to a party, and that
                 party shall so respond, to a maximum of any combination of
                 thirty-five (35) (none of which may have subparts) of
                 interrogatories, demands to produce documents, and requests
                 for admission.

                 Each party shall bear its own costs of the arbitration.  A
                 party seeking discovery shall reimburse the responding party
                 the costs of production of documents (to include search time
                 and reproduction costs).  The parties shall equally split the
                 fees of the arbitration and the arbitrators.

11.4     Effect of Termination.

         (a)     Neither party shall be liable to the other for damages of any
                 sort resulting solely from terminating this Agreement in
                 accordance with its terms.

         (b)     Any end user licenses already validly granted by PN as the
                 effective date of termination shall not be affected and shall
                 survive termination.





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11.5     Survival.  In the event of termination or expiration of this Agreement
         for any reason, Sections 2.1 (provided that Microsoft has paid the
         applicable license fees set forth in Section 3), 2.2, 2.4(c), 3.2 (to
         the extent fees are due and owing), 4, 8.2, 9, 10, 11, 12 and 13 shall
         survive termination.

12.  LIMITATION OF LIABILITIES

NEITHER PARTY SHALL BE LIABLE FOR ANY INDIRECT, INCIDENTAL, CONSEQUENTIAL,
PUNITIVE OR SPECIAL DAMAGES, EVEN IF SUCH PARTY HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.

13.      GENERAL

13.1     Notices.  All notices and requests in connection with this Agreement
         shall be deemed given as of the day they are received either by
         messenger, delivery service, or in the United States of America mails,
         postage prepaid, certified or registered, return receipt requested,
         and addressed as follows:

         To PN:                             To Microsoft:
         
         Progressive Networks, Inc.         Microsoft Corporation
         1111 Third Avenue, Suite 2900      One Microsoft Way
         Seattle, WA 98101                  Redmond, WA 98052-6399
         Attention: General Counsel         Attention:
         
         Phone: (206) 674-2213              Phone:  (425) 882-8080
         
         Fax: (206) 674-2695                Fax:  (425) 936-7329
         
                                            Copy to:
                                            Microsoft Corporation
                                            One Microsoft Way
                                            Redmond, WA 98052-6399
                                            Attention: Law & Corporate Affairs
         
                                            Fax: (206) 936-7409
         
         or to such other address as a party may designate pursuant to this
         notice provision.

13.2     Independent Contractors.  PN is an independent contractor for
         Microsoft and nothing in this Agreement shall be construed as creating
         an employer-employee relationship, a partnership, or a joint venture
         between the parties.

13.3     Taxes.  In the event taxes are required to be withheld on payments
         made under this Agreement by any U.S.  (state or federal) or foreign
         government, Microsoft may deduct such taxes from the amount owed PN
         and pay them to the appropriate taxing authority.  Microsoft shall in
         turn promptly secure and deliver to PN an official receipt for any
         taxes withheld.  Microsoft will use reasonable efforts to minimize
         such taxes to the extent permissible under applicable law.

13.4     Governing Law.  This Agreement shall be governed by the laws of the
         State of Washington as though entered into between Washington
         residents and to be performed entirely within the State of Washington,
         and PN consents to jurisdiction and venue in the state and federal
         courts sitting in the State of Washington.  In any action or suit to
         enforce any right or remedy under this Agreement or to interpret any
         provision of this Agreement, the prevailing party shall be entitled to
         recover its costs, including reasonable attorneys' fees.





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13.5     Assignment.  This Agreement shall be binding upon and inure to the
         benefit of each party's respective successors and lawful assigns;
         provided, however, that PN may not assign this Agreement, in whole or
         in part, without the prior written approval of Microsoft. For purposes
         of this Agreement, a merger, consolidation, or other corporate
         reorganization, or a transfer or sale of any or all of a party's stock,
         or of all or substantially all of its assets shall be deemed to be an
         assignment; provided, however, that an IPO of PN stock shall not be
         considered an assignment.

13.6     Construction.  If for any reason a court of competent jurisdiction
         finds any provision of this Agreement, or portion thereof, to be
         unenforceable, that provision of the Agreement will be enforced to the
         maximum extent permissible so as to effect the intent of the parties,
         and the remainder of this Agreement will continue in full force and
         effect.  Failure by either party to enforce any provision of this
         Agreement will not be deemed a waiver of future enforcement of that or
         any other provision.  This Agreement has been negotiated by the
         parties and their respective counsel and will be interpreted fairly in
         accordance with its terms and without any strict construction in favor
         of or against either party.

13.7     Entire Agreement.  This Agreement does not constitute an offer by
         Microsoft and it shall not be effective until signed by both parties.
         This Agreement constitutes the entire agreement between the parties
         with respect to the subject matter hereof and merges all prior and
         contemporaneous communications.  It shall not be modified except by a
         written agreement dated subsequent to the date of this Agreement and
         signed on behalf of PN and Microsoft by their respective duly
         authorized representatives.

IN WITNESS WHEREOF, the parties have entered into this Agreement as of the
Effective Date written above.


- --------------------------------------------------------------------------------
  MICROSOFT CORPORATION                            PROGRESSIVE NETWORKS
- --------------------------------------------------------------------------------



  By:   [s] Paul Martiz                            By:   [s] Rob Glaser
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  Name (Print):  Paul Martiz                       Name (print):  Rob Glaser
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  Title:  Group VP, Applications & Platforms       Title:  CEO
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  Date:  6/17/97                                   Date:  6-17-97
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