EXHIBIT NO. 99.4

                      AGREEMENT AND PLAN OF REORGANIZATION

      THIS AGREEMENT AND PLAN OF REORGANIZATION (the "Agreement") is made this
25th day of October, 2006, by and between MFS Government Limited Maturity Fund,
a Massachusetts business trust (the "Acquired Fund"), and MFS Series Trust IX, a
Massachusetts business trust ("Trust IX"), on behalf of MFS Limited Maturity
Fund, a segregated portfolio of assets ("series") thereof (the "Surviving
Fund"), each with its principal place of business at 500 Boylston Street,
Boston, Massachusetts 02116. Each of the Acquired Fund and the Surviving Fund
are also referred to herein as a "Fund" and, together, as the "Funds."

      This Agreement is intended to be and is adopted as a plan of
reorganization within the meaning of the regulations under Section 368(a) (the
"Regulations") of the United States Internal Revenue Code of 1986, as amended
(the "Code"). The reorganization will consist of (1) the transfer of the Assets
(as defined herein) of the Acquired Fund to the Surviving Fund in exchange
solely for the assumption by the Surviving Fund of the Liabilities (as defined
herein) of the Acquired Fund and the issuance to the Acquired Fund of shares of
beneficial interest, no par value ("shares"), in the Surviving Fund (the
"Reorganization Shares"), (2) the distribution of the Reorganization Shares to
the shareholders of the Acquired Fund in liquidation of the Acquired Fund as
provided herein and (3) the termination of the Acquired Fund, all upon the terms
and conditions hereinafter set forth in this Agreement (collectively, the
"Reorganization").

      All representations, warranties, covenants and obligations of the
Surviving Fund and the Acquired Fund (each a "Fund") contained herein shall be
deemed to be representations, warranties, covenants and obligations of the
Acquired Fund and Trust IX, acting on behalf of the Surviving Fund,
respectively, and all rights and benefits created hereunder in favor of the
Surviving Fund and the Acquired Fund shall inure to, and shall be enforceable
by, the Acquired Fund and Trust IX, acting on behalf of the Surviving Fund,
respectively.

      The Acquired Fund's shares are divided into four classes, designated Class
A, Class B, Class C, and Class I shares (the "Class A Acquired Fund Shares,"
"Class B Acquired Fund Shares," "Class C Acquired Fund Shares", and "Class I
Acquired Fund Shares," respectively, and together, the "Acquired Fund Shares").
The Surviving Fund's shares are divided into thirteen classes, including four
classes designated Class A, Class B, Class C, and Class I shares (the "Class A
Reorganization Shares," "Class B Reorganization Shares," "Class C Reorganization
Shares", and "Class I Reorganization Shares," respectively), which four classes
are the only classes of the Surviving Fund's shares involved in the
Reorganization and thus included in the term "Reorganization Shares." Each class
of Acquired Fund Shares is substantially similar to the corresponding class of
Reorganization Shares, i.e., the Funds' Class A, Class B, Class C and Class I
shares


correspond to each other.

      In consideration of the premises of the covenants and agreements
hereinafter set forth, the parties hereto covenant and agree as follows:

1. The Reorganization

      1.1 The Acquired Fund will transfer to the Surviving Fund all of its
assets (consisting of, without limitation, portfolio securities and instruments,
dividend and interest receivables, claims and rights of action, cash and other
assets) as set forth in a statement of assets and liabilities as of the
Valuation Date (as defined in paragraph 2.1 hereof) prepared in accordance with
generally accepted accounting principles consistently applied, certified by the
Acquired Fund's Treasurer or Assistant Treasurer and delivered by the Acquired
Fund to the Surviving Fund pursuant to paragraph 5.6 hereof (the "Statement of
Assets and Liabilities") (collectively, the "Assets"), free and clear of all
liens and encumbrances, except as otherwise provided herein, in exchange solely
for (a) the assumption by the Surviving Fund of all of the liabilities of the
Acquired Fund as set forth in the Statement of Assets and Liabilities
(collectively, the "Liabilities") and (b) the issuance and delivery by the
Surviving Fund to the Acquired Fund, for distribution in accordance with
paragraph 1.3 hereof pro rata to the Acquired Fund shareholders of record
determined as of the close of business on the Valuation Date (the "Acquired Fund
Shareholders"), of the number of full and fractional (rounded to the third
decimal place) Reorganization Shares determined as provided in paragraph 2.2
hereof. Such transactions shall take place at the closing provided for in
paragraph 3.1 hereof (the "Closing").

      1.2 The Acquired Fund has provided the Surviving Fund with a list of the
current securities holdings and other assets of the Acquired Fund as of the date
of execution of this Agreement. The Acquired Fund reserves the right to sell any
of these securities or other assets prior to the Closing.

      1.3 On or as soon after the closing date established in paragraph 3.1
hereof (the "Closing Date") as is conveniently practicable (the "Liquidation
Date"), the Acquired Fund will distribute the Reorganization Shares it received
pursuant to paragraph 1.1 hereof pro rata to the Acquired Fund Shareholders in
actual or constructive exchange for their Acquired Fund Shares in complete
liquidation of the Acquired Fund. Such distribution will be accomplished by the
transfer of the Class A, Class B, Class C, and/or Class I Reorganization Shares
then credited to the account of the Acquired Fund on the books of the Surviving
Fund to open accounts on the share records of the Surviving Fund in the names of
the Acquired Fund Shareholders and representing the respective pro rata number
of full and fractional (rounded to the third decimal place) Class A, Class B,
Class C, and/or Class I Reorganization Shares due such shareholders, by class
(i.e., the account for each Acquired Fund Shareholder of Class A, Class B, Class
C, and/or Class I Acquired Fund Shares shall be credited with the respective pro
rata number of


Class A, Class B, Class C, and/or Class I (as applicable)  Reorganization Shares
due that  shareholder).  The  Surviving  Fund will not issue share  certificates
representing  the  Reorganization  Shares in connection with such  distribution,
except in connection  with pledges and  assignments and in certain other limited
circumstances.

      1.4 Acquired Fund Shareholders holding certificates representing their
ownership of Acquired Fund Shares shall surrender such certificates or deliver
an affidavit with respect to lost certificates, in such form and accompanied by
such surety bonds as the Acquired Fund may require (collectively, an
"Affidavit"), to the Acquired Fund prior to the Closing Date. Any Acquired Fund
Share certificate that remains outstanding on the Closing Date shall be deemed
to be cancelled, shall no longer show evidence of ownership of Acquired Fund
Shares and shall not evidence ownership of any Reorganization Shares. Unless and
until any such certificate shall be so surrendered or an Affidavit relating
thereto shall be delivered, any dividends and other distributions payable by the
Surviving Fund subsequent to the Closing Date with respect to the Reorganization
Shares allocable to a holder of such certificate(s) shall be paid to such
holder, but such holder may not redeem or transfer such Reorganization Shares.

      1.5 Any transfer taxes payable upon issuance of the Reorganization Shares
in a name other than the registered holder of the Acquired Fund Shares on the
books of the Acquired Fund as of that time shall, as a condition of such
issuance and transfer, be paid by the person to whom such Reorganization Shares
are to be issued and transferred.

2. Valuation

      2.1 The net asset value of each class of the Reorganization Shares and the
net value of the Assets shall in each case be determined as of the close of
business on the last business day preceding the Closing Date (the "Valuation
Date"). The net asset value of each class of the Reorganization Shares shall be
computed by State Street Bank and Trust Company (the "Custodian"), as custodian
and pricing agent for the Surviving Fund, using the valuation procedures set
forth in the Trust IX's Amended and Restated Declaration of Trust ("the Trust
IX's Declaration of Trust") or By-laws and the Surviving Fund's then-current
prospectus and statement of additional information (collectively, the "Surviving
Fund Valuation Procedures"), to not less than two decimal places. The net value
of the Assets shall be computed by the Custodian, as custodian and pricing agent
for the Acquired Fund, by calculating the value of the Assets and subtracting
therefrom the amount of the Liabilities, using the valuation procedures set
forth in the Acquired Fund's Amended and Restated Declaration of Trust
("Acquired Fund's Declaration of Trust") or By-laws and the Acquired Fund's
then-current prospectus and statement of additional information (collectively,
the "Acquired Fund Valuation Procedures"). The determinations of the Custodian
shall be conclusive and binding on all parties in interest; provided,


however,  that, in computing each Fund's net asset value in accordance with this
paragraph 2.1, any fair value determination required to be made by the Surviving
Fund Valuation  Procedures or Acquired Fund Valuation Procedures with respect to
a portfolio  security or other asset of either Fund shall be made in  accordance
with  the  applicable  Fund's  Valuation  Procedures,  and any such  fair  value
determinations  shall be conclusive and binding on the Custodian and all parties
in interest.

      2.2 The number of each class of Reorganization Shares (including
fractional shares, if any, rounded to the third decimal place) the Surviving
Fund shall issue pursuant to paragraph 1.1(b) hereof shall be as follows: (a)
the number of Class A Reorganization Shares shall be determined by dividing the
net value of the Assets (computed as set forth in paragraph 2.1 hereof) (the
"Acquired Fund Value") attributable to the Class A Acquired Fund Shares by the
net asset value of a Class A Reorganization Share (computed as set forth in such
paragraph), (b) the number of Class B Reorganization Shares shall be determined
by dividing the Acquired Fund Value attributable to the Class B Acquired Fund
Shares by the net asset value of a Class B Reorganization Share (as so
computed), (c) the number of Class C Reorganization Shares shall be determined
by dividing the Acquired Fund Value attributable to the Class C Acquired Fund
Shares by the net asset value of a Class C Reorganization Share (as so
computed), and (d) the number of Class I Reorganization Shares shall be
determined by dividing the Acquired Fund Value attributable to the Class I
Acquired Fund Shares by the net asset value of a Class I Reorganization Share
(as so computed).

      2.3 Except for certain fair value determinations as described in paragraph
2.1 hereof, all computations of value shall be made by the Custodian in its
capacity as pricing agent for the Surviving Fund and the Acquired Fund, as
applicable, and in accordance with its regular practice in pricing the shares
and assets of the Surviving Fund and the Acquired Fund, as applicable, using the
relevant Fund's Valuation Procedures.

3. Closing and Closing Date

      3.1 The Closing Date shall be as soon as practicable after the
Reorganization is approved by shareholders of the Acquired Fund, but in no event
later than November 30, 2006. The Closing shall be held at 8:00 a.m., Boston
time, at the offices of the Surviving Fund, 500 Boylston Street, Boston,
Massachusetts 02116, or at such other time and/or place as the parties may
agree.

      3.2 Portfolio securities shall be transferred by the Acquired Fund to the
Custodian for the account of the Surviving Fund on the Closing Date, duly
endorsed in proper form for transfer, in such condition as to constitute good
delivery thereof in accordance with the custom of brokers or, in the case of
portfolio securities held in the US Treasury Department's book-entry system or
by


the Depository Trust Company or other third-party depositories, by transfer
to the account of the Custodian in accordance with Rule 17f-4, Rule 17f-5, or
Rule 17f-7, as the case may be, under the Investment Company Act of 1940, as
amended (the "1940 Act") and shall be accompanied by all necessary federal and
state stock transfer stamps or a check for the appropriate purchase price
thereof. The cash delivered shall be in the form of currency, certified or
official bank check or federal fund wire, payable to the order of "State Street
Bank and Trust Company, Custodian for the MFS Limited Maturity Fund" or in the
name of any successor organization.

      3.3 If on the Valuation Date (a) the New York Stock Exchange shall be
closed to trading or trading thereon shall be restricted or (b) trading or the
reporting of trading on such exchange or elsewhere shall be disrupted so that
accurate appraisal of the net value of the Assets or the net asset value of each
class of the Reorganization Shares is impracticable, the Valuation Date shall be
postponed until the next business day when trading shall have been fully resumed
and reporting shall have been restored and the Closing Date shall be adjusted
accordingly to the first business day following the Valuation Date; provided
that if trading shall not be fully resumed and reporting restored on or before
December 31, 2006, this Agreement may be terminated by either Fund upon the
giving of written notice to the other.

      3.4 The Acquired Fund shall deliver at the Closing a list of the names,
addresses, federal taxpayer identification numbers and backup withholding and
nonresident alien withholding status of the Acquired Fund Shareholders and the
number of outstanding Acquired Fund Shares owned by each such shareholder, all
as of the close of business on the Valuation Date (the "Shareholder List"). The
Surviving Fund shall issue and deliver to the Acquired Fund a confirmation
evidencing the Reorganization Shares to be credited on the Liquidation Date, or
provide evidence satisfactory to the Acquired Fund that such Reorganization
Shares have been credited to the Acquired Fund's account on the books of the
Surviving Fund. At the Closing each party shall deliver to the other such bills
of sale, checks, assignments, stock certificates, receipts or other documents as
such other party or its counsel may reasonably request.

4. Representations and Warranties

      4.1 The Acquired Fund represents and warrants to Trust IX, on behalf of
the Surviving Fund, as follows:

            (a) The Acquired Fund is a business trust that is duly organized,
      validly existing and in good standing under the laws of The Commonwealth
      of Massachusetts and has the power to own all of its properties and assets
      and, subject to approval by the shareholders of the Acquired Fund, to
      carry out its obligations under this Agreement. The Acquired Fund is not
      required to qualify to do business in any other jurisdiction. This
      Agreement has been


       duly authorized by the Acquired Fund, subject to the
      approval of the shareholders of the Acquired Fund. The Acquired Fund has
      all necessary federal, state and local authorizations to own all of the
      properties and assets of the Acquired Fund and to carry on its business as
      now being conducted.

            (b) The Acquired Fund is a duly registered investment company
      classified as a management company of the open-end type, and its
      registration with the Securities and Exchange Commission (the
      "Commission") as an investment company under the 1940 Act, is in full
      force and effect;

            (c) The Acquired Fund is not, and the execution, delivery and
      performance of this Agreement by the Acquired Fund will not result, in
      violation of any provision of the Acquired Fund's Declaration of Trust or
      By-Laws or of any agreement, indenture, instrument, contract, lease or
      other undertaking to which Acquired Fund is a party or by which the
      Acquired Fund is bound;

            (d) The Acquired Fund has no material contracts or other commitments
      (other than this Agreement and agreements for the purchase and sale of
      securities entered into in the ordinary course of business and consistent
      with the Fund's obligations under this Agreement) that will not be
      terminated at or prior to the Closing Date and no such termination will
      result in liability to the Acquired Fund (or the Surviving Fund);

            (e) Except as otherwise disclosed in writing to and accepted by
      Trust IX, on behalf of the Surviving Fund, no material litigation or
      administrative proceeding or investigation of or before any court or
      governmental body is currently pending or, to the knowledge of the
      Acquired Fund, threatened against the Acquired Fund or any of its
      properties or assets. The Acquired Fund knows of no facts that might form
      the basis for the institution of such proceedings, and the Acquired Fund
      is not a party to or subject to the provisions of any order, decree or
      judgment of any court or governmental body that materially and adversely
      affects its business or its ability to consummate the transactions herein
      contemplated;

            (f) The statement of assets and liabilities, including the schedule
      of portfolio investments, of the Acquired Fund as of December 31, 2005,
      and the related statement of operations for the fiscal year then ended,
      and the statement of changes in net assets for the fiscal years ended
      December 31, 2005 and December 31, 2004 (copies of which have been
      furnished to the Surviving Fund) have been audited by Ernst & Young LLP,
      Independent Registered Public Accountants, and present fairly in all
      material respects the financial position of the Acquired Fund as of
      December 31, 2005 and the results of its operations and changes in net
      assets for the respective stated periods in accordance with accounting
      principles generally accepted in the


      United States of America consistently  applied, and there are no known
      actual  or  contingent  liabilities  of the  Acquired  Fund  as of the
      respective  dates  thereof  not  disclosed   therein.   The  unaudited
      statement  of  assets  and  liabilities,  including  the  schedule  of
      portfolio  investments,  of the Acquired Fund as of June 30, 2006, and
      the related statement of operations for the fiscal  semi-annual period
      then ended,  and the statement of changes in net assets for the fiscal
      semi-annual  period  ended  June 30,  2006  (copies of which have been
      furnished  to the  Surviving  Fund)  present  fairly  in all  material
      respects the  financial  position of the Acquired  Fund as of June 30,
      2006 and the results of its  operations  and changes in net assets for
      the  semi-annual  period  in  accordance  with  accounting  principles
      generally  accepted  in the  United  States  of  America  consistently
      applied,  and there are no known actual or contingent  liabilities  of
      the Acquired Fund as of June 30, 2006 not disclosed therein;

             (g) Since December 31, 2005, there has not been any material
      adverse change in the Acquired Fund's financial condition, assets,
      liabilities or business other than changes occurring in the ordinary
      course of business, or any incurrence by the Acquired Fund of indebtedness
      maturing more than one year from the date such indebtedness was incurred,
      except as otherwise disclosed to and accepted by Trust IX, on behalf of
      the Surviving Fund. For the purposes of this subparagraph (g), a decline
      in net asset value per Acquired Fund Share resulting from losses upon the
      disposition of investments or from changes in the value of investments
      held by the Acquired Fund, or a distribution or a payment of dividends
      shall not constitute a material adverse change;

             (h) As of the Closing Date, the Acquired Fund will have, within the
      times and in the manner prescribed by law, properly filed all required
      federal and other tax returns and reports which, to the knowledge of the
      Acquired Fund's officers, are required to have been filed by the Acquired
      Fund by such date and all such returns and reports were complete and
      accurate in all material respects. The Acquired Fund has timely paid or
      will timely pay, in the manner prescribed by law, all federal and other
      taxes shown to be due on said returns or on any assessments received by
      the Acquired Fund. All tax liabilities of the Acquired Fund have been
      adequately provided for on its books, and no tax deficiency or liability
      of the Acquired Fund has been asserted, and no question with respect
      thereto has been raised or is under audit, by the Internal Revenue Service
      or by any state, local or other tax authority for taxes in excess of those
      already paid.

             (i) For each taxable year of its operations and since its
      inception, for federal income tax purposes, the Acquired Fund has
      satisfied, and for the current taxable year, it will satisfy the
      requirements of Subchapter M of the Code for qualification and treatment
      as a "regulated investment company," and the provisions of sections 851
      through 855 of the Code have applied and will continue to apply to
      Acquired Fund for each taxable year since its


      inception and for the remainder of its current  taxable year beginning
      January 1, 2006 and ending on the Closing Date.

             Acquired Fund will declare to Acquired Fund shareholders of record
      on or prior to the Closing Date a dividend or dividends which together
      with all previous such dividends shall have the effect of distributing to
      the Acquired Fund shareholders (a) all of the excess of (i) Acquired
      Fund's investment income excludable from gross income under section 103(a)
      of the Code over (ii) Acquired Fund's deductions disallowed under sections
      265 and 171(a)(2) of the Code, (b) all of Acquired Fund's investment
      company taxable income (as defined in section 852 of the Code), (computed
      in each case without regard to any deduction for dividends paid), and (c)
      all of Acquired Fund's net realized capital gain (after reduction for any
      capital loss carryover) in each case for both the taxable year ending on
      December 31, 2005 and the short taxable year beginning on January 1, 2006
      and ending on the Closing Date. Such dividends will be made to ensure
      continued qualification of Acquired Fund as a "regulated investment
      company" for tax purposes and to eliminate fund-level tax.

            (j) The authorized capital of the Acquired Fund consists of an
      unlimited number of shares, divided into four classes at the date hereof.
      All issued and outstanding Acquired Fund Shares are, and at the Closing
      Date will be, duly and validly issued and outstanding, fully paid and
      nonassessable by the Acquired Fund (except as described in the Acquired
      Fund's current prospectus and statement of additional information). All of
      the issued and outstanding Acquired Fund Shares will, at the time of
      Closing, be held by the persons and in the amounts set forth in the
      Shareholder List. The Acquired Fund does not have outstanding any options,
      warrants or other rights to subscribe for or purchase any Acquired Fund
      Shares, nor is there outstanding any security convertible into any
      Acquired Fund Shares;

            (k) Except as previously disclosed to Trust IX, at the Closing Date
      the Acquired Fund will have good and marketable title to the Assets and
      full right, power and authority to sell, assign, transfer and deliver the
      Assets hereunder, and upon delivery and payment for the Assets, the
      Surviving Fund will acquire good and marketable title thereto subject to
      no restrictions on the full transfer thereof, including such restrictions
      as might arise under the Securities Act of 1933, as amended (the "1933
      Act");

            (l) The execution, delivery and performance of this Agreement have
      been duly authorized by all necessary action on the part of the Acquired
      Fund (with the exception of the approval of this Agreement by the Acquired
      Fund's shareholders holding at least a majority of the outstanding voting
      securities (as defined by the 1940 Act) of the Acquired Fund), and this
      Agreement constitutes a valid and binding obligation of the Acquired Fund
      enforceable in accordance with its terms, subject to the approval of such


      shareholders and, subject as to enforcement, to bankruptcy, insolvency,
      reorganization, moratorium and other laws relating to or affecting
      creditors' rights and to general equity principles;

            (m) The information to be furnished by the Acquired Fund for use in
      applications for orders, registration statements, proxy materials and
      other documents that may be necessary in connection with the transactions
      contemplated hereby shall be accurate and complete and shall comply fully
      with federal securities and other laws and regulations thereunder
      applicable thereto;

            (n) The proxy statement of the Acquired Fund (the "Proxy Statement")
      to be included in the Registration Statement (as defined in paragraph 5.7
      hereof) (other than written information furnished by the Surviving Fund
      for inclusion therein, as covered by the Trust IX's representation and
      warranty in paragraph 4.2(n) hereof), on the effective date of the
      Registration Statement, on the date of the Meeting (as defined in
      paragraph 5.2 hereof) and on the Closing Date, will not contain any untrue
      statement of a material fact or omit to state a material fact required to
      be stated therein or necessary to make the statements therein, in light of
      the circumstances under which such statements were made, not misleading;

            (o) No consent, approval, authorization or order of any court or
      governmental authority is required for the consummation by the Acquired
      Fund of the transactions contemplated by this Agreement, except such as
      have been obtained under the 1933 Act, the Securities Exchange Act of
      1934, as amended, and the 1940 Act and the rules and regulations
      thereunder (collectively, the "Acts"), and such as may be required under
      state securities laws;

            (p) All of the issued and outstanding Acquired Fund Shares have been
      offered for sale and sold in conformity with all applicable federal and
      state securities laws, except as may have been previously disclosed in
      writing to the Surviving Fund;

            (q) The current prospectus and statement of additional information
      of the Acquired Fund, each dated May 1, 2006, as supplemented and updated
      from time to time, will conform in all material respects to the applicable
      requirements of the 1933 Act and the 1940 Act and the rules and
      regulations of the Commission thereunder on the date of the Proxy
      Statement, on the date of the Meeting and on the Closing Date and will not
      on any of such dates include any untrue statement of a material fact or
      omit to state any 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; and


            (r) The Acquired Fund incurred the Liabilities in the ordinary
      course of its business.

      4.2 Trust IX, on behalf of the Surviving Fund, represents and warrants to
the Acquired Fund, as follows:

            (a) Trust IX is a business trust that is duly organized, validly
      existing and in good standing under the laws of The Commonwealth of
      Massachusetts and has the power to own all of its properties and assets
      and to carry out its obligations under this Agreement. Neither Trust IX
      nor the Surviving Fund is required to qualify to do business in any other
      jurisdiction. This Agreement has been duly authorized by Trust IX on
      behalf of the Surviving Fund. Trust IX has all necessary federal, state
      and local authorizations to own all of its properties and assets and to
      carry on its business as now being conducted.

            (b) Trust IX is a duly registered investment company classified as a
      management company of the open-end type, and its registration with the
      Commission as an investment company under the 1940 Act is in full force
      and effect; and the Surviving Fund is a separate series of Trust IX duly
      constituted in accordance with the applicable provisions of the Trust IX's
      Declaration of Trust and By-laws and the laws of the Commonwealth of
      Massachusetts;

            (c) The current prospectus and statement of additional information
      of the Surviving Fund, each dated September 1, 2005, as supplemented and
      updated from time to time (collectively, the "Surviving Fund Prospectus"),
      and the Registration Statement (other than written information furnished
      by the Acquired Fund for inclusion therein as covered by the Acquired
      Fund's representation and warranty in paragraph 4.1(m) hereof) will
      conform in all material respects to the applicable requirements of the
      1933 Act and the 1940 Act and the rules and regulations of the Commission
      thereunder on the date of the Proxy Statement, on the date of the Meeting
      and on the Closing Date and will not on any of such dates include any
      untrue statement of a material fact or omit to state any 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;

            (d) At the Closing Date, the Surviving Fund will have good and
      marketable title to its assets;

            (e) The Surviving Fund is not, and the execution, delivery and
      performance of this Agreement will not result, in violation of Trust IX's
      Declaration of Trust or By-Laws or of any agreement, indenture,
      instrument, contract, lease or other undertaking to which Trust IX or the
      Surviving Fund is a party or by which Trust IX or the Surviving Fund is
      bound;


            (f) Unless otherwise disclosed to the Acquired Fund, no material
      litigation or administrative proceeding or investigation of or before any
      court or governmental body is currently pending or, to the knowledge of
      Trust IX or the Surviving Fund, threatened against Trust IX or the
      Surviving Fund or any of its properties or assets, except as previously
      disclosed in writing to the Acquired Fund. The Surviving Fund knows of no
      facts that might form the basis for the institution of such proceedings,
      and Trust IX or the Surviving Fund is not a party to or subject to the
      provisions of any order, decree or judgment of any court or governmental
      body that materially and adversely affects its business or its ability to
      consummate the transaction herein contemplated;

            (g) The statement of assets and liabilities, including the schedule
      of portfolio investments, of the Surviving Fund as of April 30, 2006, and
      the related statement of operations for the fiscal year then ended, and
      the statement of changes in net assets for the fiscal years ended April
      30, 2006 and April 30, 2005 (copies of which have been furnished to the
      Acquired Fund) have been audited by Deloitte & Touche LLP, Independent
      Registered Public Accountants, and present fairly in all material respects
      the financial position of the Surviving Fund as of April 30, 2006 and the
      results of its operations and changes in net assets for the respective
      stated periods in accordance with accounting principles generally accepted
      in the United States of America consistently applied, and there are no
      known actual or contingent liabilities of the Surviving Fund as of the
      respective dates thereof not disclosed therein;

            (h) Since April 30, 2006, there has not been any material adverse
      change in the Surviving Fund's financial condition, assets, liabilities or
      business other than changes occurring in the ordinary course of business,
      or any incurrence by the Surviving Fund of indebtedness maturing more than
      one year from the date such indebtedness was incurred, except as otherwise
      disclosed to and accepted by the Acquired Fund. For the purposes of this
      subparagraph (h), a decline in net asset value per Surviving Fund Share
      resulting from losses upon the disposition of investments or from changes
      in the value of investments held by the Surviving Fund, or a distribution
      or a payment of dividends, shall not constitute a material adverse change;

             (i) As of the Closing Date, Trust IX, on behalf of the Surviving
      Fund, will have, within the times and in the manner prescribed by law,
      properly filed all federal and other tax returns and reports which, to the
      knowledge of the officers of Trust IX, are required to be filed by the
      Trust IX on behalf of the Surviving Fund, and all such returns and reports
      were complete and accurate in all material respects. Trust IX, on behalf
      of the Surviving Fund, has timely paid or will timely pay, in the manner
      prescribed by law, all federal and other taxes shown to be due on said
      returns or on any assessments received by the Surviving Fund. All tax
      liabilities of the Surviving Fund have been


      adequately  provided  for on its  books,  and  no  tax  deficiency  or
      liability of the  Surviving  Fund has been  asserted,  and no question
      with  respect  thereto  has  been  raised  or is under  audit,  by the
      Internal Revenue Service or by any state, local or other tax authority
      for taxes in excess of those already paid.

             (j) For each taxable year of its operations since its inception,
      for federal income tax purposes, the Surviving Fund has satisfied, and for
      the current taxable year, it will satisfy the requirements of Subchapter M
      of the Code for qualification and treatment as a regulated investment
      company, and the provisions of sections 851 through 855 of the Code have
      applied and will continue to apply to the Surviving Fund for each taxable
      year since its inception and for the remainder of its current taxable year
      beginning May 1, 2006 and ending on the Closing Date.

            (k) The authorized capital of the Surviving Fund consists of an
      unlimited number of shares and divided into thirteen classes, at the date
      hereof. All issued and outstanding Surviving Fund Shares are, and at the
      Closing Date will be, duly and validly issued and outstanding, fully paid
      and nonassessable by the Surviving Fund (except as described in the
      Surviving Fund's current prospectus and statement of additional
      information). The Surviving Fund does not have outstanding any options,
      warrants or other rights to subscribe for or purchase any Surviving Fund
      Shares, nor is there outstanding any security convertible into any such
      shares;

            (l) The execution, delivery and performance of this Agreement have
      been duly authorized by all necessary action on the part of Trust IX, on
      behalf of the Surviving Fund, and this Agreement constitutes a valid and
      binding obligation of the Surviving Fund enforceable in accordance with
      its terms, subject as to enforcement, to bankruptcy, insolvency,
      reorganization, moratorium and other laws relating to or affecting
      creditors' rights and to general equity principles;

            (m) The Reorganization Shares to be issued and delivered to the
      Acquired Fund pursuant to the terms of this Agreement will be duly
      authorized at the Closing Date and, when so issued and delivered, will be
      duly and validly issued Surviving Fund Shares and will be fully paid and
      nonassessable by the Surviving Fund (except as described in the Surviving
      Fund's current prospectus and statement of additional information);

            (n) The information to be furnished by the Surviving Fund for use in
      applications for orders, registration statements, proxy materials and
      other documents that may be necessary in connection with the transactions
      contemplated hereby shall be accurate and complete and shall comply fully
      with federal securities and other laws and regulations applicable thereto;

            (o) Trust IX, on behalf of the Surviving Fund, agrees to use all


      reasonable efforts to obtain the approvals and authorizations required by
      the 1933 Act, the 1940 Act and such state securities laws or other
      securities laws as it may deem appropriate in order to continue its
      operations and the operations of the Surviving Fund after the Closing
      Date;

            (p) All of the Surviving Fund's issued and outstanding Surviving
      Fund Shares have been offered for sale and sold in conformity with all
      applicable federal and state securities laws, except as may have been
      previously disclosed in writing to the Acquired Fund;

            (q) No consent, approval, authorization or order of any court or
      governmental authority is required for the consummation by the Surviving
      Fund, of the transactions contemplated by this Agreement, except such as
      have been obtained under the Acts and such as may be required under state
      securities laws; and

            (r) No consideration other than Reorganization Shares (and the
      Surviving Fund's assumption of the Liabilities) will be issued in exchange
      for the Assets in the Reorganization.

5. Covenants

      5.1 Each Fund will operate its business in the ordinary course between the
date hereof and the Closing Date, it being understood that such ordinary course
of business will include the declaration and payment of customary dividends and
other distributions.

      5.2 The Acquired Fund will call a meeting of shareholders of the Acquired
Fund (the "Meeting") to consider and act upon this Agreement and to take all
other action necessary to obtain approval of the transactions contemplated
herein.

      5.3 The Acquired Fund covenants that the Reorganization Shares to be
issued hereunder are not being acquired for the purpose of making any
distribution thereof other than in accordance with the terms of this Agreement.

      5.4 The Acquired Fund will provide such information as Trust IX reasonably
requests concerning the ownership of Acquired Fund Shares, including the
information specified in paragraph 3.4 hereof.

      5.5 Subject to the provisions of this Agreement, the Acquired Fund and
Trust IX each will take, or cause to be taken, all action, and do or cause to be
done all things, reasonably necessary, proper or advisable to consummate and
make effective the transactions contemplated by this Agreement.

      5.6 The Acquired Fund will furnish to Trust IX on the Closing Date the



Statement of Assets and Liabilities. As promptly as practicable, but in any case
within 60 days after the Closing Date, the Acquired Fund or its designee will
furnish to Trust IX, in such form as is reasonably satisfactory to Trust IX, a
statement of the earnings and profits of the Acquired Fund for federal income
tax purposes, and of any capital loss carryovers and other items that the
Surviving Fund will succeed to and take into account as a result of Section 381
of the Code.

      5.7 Trust IX, on behalf of the Surviving Fund, will prepare and file with
the Commission a Registration Statement on Form N-14 (the "Registration
Statement") in compliance with the 1933 Act and the 1940 Act, in connection with
the issuance of the Reorganization Shares as contemplated herein.

      5.8 Trust IX, on behalf of the Surviving Fund, will prepare a Proxy
Statement, to be included in the Registration Statement in compliance with the
Acts, in connection with the Meeting to consider approval of this Agreement.

      5.9 The Acquired Fund agrees to provide the Surviving Fund with
information applicable to the Acquired Fund required under the Acts for
inclusion in the Registration Statement and the Proxy Statement.

6. Conditions Precedent to Obligations of the Acquired Fund

       The obligations of the Acquired Fund to consummate the transactions
provided for herein shall be, at its election, subject to the performance by the
Surviving Fund of all the obligations to be performed by it hereunder on or
before the Closing Date, and, in addition thereto, the following further
conditions:

      6.1 All representations and warranties of Trust IX, on behalf of the
Surviving Fund, contained in this Agreement shall be true and correct in all
material respects as of the date hereof and, except as they may be affected by
the transactions contemplated by this Agreement, as of the Closing Date with the
same force and effect as if made on and as of the Closing Date;

      6.2 Trust IX, on behalf of the Surviving Fund, shall have delivered to the
Acquired Fund on the Closing Date a certificate executed in its name by its
President, Vice President, Secretary or Assistant Secretary and Treasurer or
Assistant Treasurer, in form and substance satisfactory to the Acquired Fund and
dated as of the Closing Date, to the effect that the representations and
warranties of the Surviving Fund, made in this Agreement are true and correct at
and as of the Closing Date, except as they may be affected by the transactions
contemplated by this Agreement, and that Trust IX and the Surviving Fund shall
have complied with all covenants and agreements and satisfied all conditions on
their parts to be performed or satisfied under this Agreement at or prior to the
Closing Date, and as to such other matters as the Acquired Fund shall reasonably
request; and


      6.3 The Acquired Fund shall have received on the Closing Date a favorable
opinion from Susan S. Newton, Associate General Counsel and Senior Vice
President of Massachusetts Financial Services Company ("MFS"), the Surviving
Fund's investment adviser, dated as of the Closing Date, in a form satisfactory
to the Acquired Fund, to the effect that:

      (i)  Trust IX is a business trust duly organized and validly existing
           under the laws of The Commonwealth of Massachusetts and has power to
           own all of its properties and assets and to carry on its business as
           currently conducted, as described in the Registration Statement. The
           Surviving Fund is a separate series of Trust IX duly constituted in
           accordance with Trust IX's Declaration of Trust and By-laws;

      (ii) this Agreement has been duly authorized, executed and delivered by
           the Surviving Fund and, assuming that the Surviving Fund prospectus
           contained in the Registration Statement, the Registration Statement
           and the Proxy Statement comply with the Acts, and assuming due
           authorization, execution and delivery of this Agreement by the
           Acquired Fund, is a valid and binding obligation of Trust IX and the
           Surviving Fund enforceable against Trust IX and the Surviving Fund in
           accordance with its terms, except as the same may be limited by
           bankruptcy, insolvency, reorganization or other similar laws
           affecting the enforcement of creditors' rights generally and other
           equitable principles;

      (iii) assuming that consideration therefor of not less than the net asset
           value thereof has been paid, the Reorganization Shares to be issued
           and delivered to the Acquired Fund on behalf of the Acquired Fund
           Shareholders as provided by this Agreement are duly authorized and
           upon such issuance and delivery will be validly issued and
           outstanding and fully paid and nonassessable by the Surviving Fund
           (except as described in the Surviving Fund's current prospectus and
           statement of additional information), and no shareholder of the
           Surviving Fund has any preemptive right to subscription or purchase
           in respect thereof pursuant to any federal or Massachusetts law or
           the Trust IX's Declaration of Trust or By-laws;

      (iv) the execution and delivery of this Agreement did not, and the
           consummation of the transactions contemplated hereby will not,
           violate Trust IX's Declaration of Trust or By-Laws, or any material
           provision of any agreement (known to such counsel) to which the Trust
           IX or the Surviving Fund is a party or by which it is bound or, to
           the knowledge of such counsel, result in the acceleration of any
           obligation or the imposition of any penalty, under any agreement,
           judgment or decree to which the Trust IX or the Surviving Fund is a
           party or by which it is bound;

      (v)  to the knowledge of such counsel, no consent, approval, authorization
           or


           order of any court or governmental  authority is required for the
           consummation  by  the  Trust  IX or  the  Surviving  Fund  of the
           transactions  contemplated  herein,  except  such  as  have  been
           obtained  under the Acts and such as may be required  under state
           securities laws;

      (vi) the descriptions in the Registration Statement of statutes, legal and
           governmental proceedings and contracts and other documents, if any,
           only insofar as they relate to Trust IX or the Surviving Fund, are
           accurate in all material respects;

      (vii) to the knowledge of such counsel, there are no legal or governmental
           proceedings relating to Trust IX or the Surviving Fund existing on or
           before the date of mailing the Proxy Statement or the Closing Date
           required to be described in the Registration Statement that are not
           described as required;

      (viii) to the knowledge of such counsel, Trust IX is a duly registered
           investment company and, to the knowledge of such counsel, its
           registration with the Commission as an investment company under the
           1940 Act is in full force and effect; and

(ix)           except as may have been previously disclosed by Trust IX, on
               behalf of the Surviving Fund, in writing, to the knowledge of
               such counsel, no litigation or administrative proceeding or
               investigation of or before any court or governmental body
               currently is pending or threatened as to Trust IX or the
               Surviving Fund or any of their properties or assets, and neither
               Trust IX nor the Surviving Fund is a party to or subject to the
               provisions of any order, decree or judgment of any court or
               governmental body that materially and adversely affects its
               business or its ability to consummate the transactions
               contemplated hereby.

           Such opinion shall also state that while such counsel has not
           independently verified, and is not passing upon and does not assume
           any responsibility for, the accuracy, completeness or fairness of the
           statements contained in the Registration Statement, she generally
           reviewed and discussed certain of such statements with certain
           officers of the Surviving Fund and that in the course of such review
           and discussion no facts came to the attention of such counsel that
           led her to believe that, on the effective date of the Registration
           Statement, the date of the Meeting or the Closing Date and only
           insofar as such statements relate to the Surviving Fund, the
           Registration Statement contained any untrue statement of a material
           fact or omitted to state a material fact necessary in order to make
           the statements made therein, in the light of the circumstances under
           which they were made, not misleading. Such opinion may state that
           such counsel does not express any opinion or belief as to the
           financial statements or other financial or


           statistical  data,  or as to  the  information  relating  to  the
           Acquired Fund,  contained in the Proxy  Statement or Registration
           Statement.  Such  opinion  may also  state  that such  opinion is
           solely  for the  benefit  of the  Acquired  Fund,  its  Board  of
           Trustees and its  officers.  Such opinion shall also include such
           other matters incidental to the transaction  contemplated  hereby
           as the Acquired Fund may reasonably request.

7. Conditions Precedent to Obligations of the Surviving Fund

      The obligations of the Surviving Fund to complete the transactions
provided for herein shall be, at its election, subject to the performance by the
Acquired Fund of all the obligations to be performed by it hereunder on or
before the Closing Date and, in addition thereto, the following conditions:

      7.1 All representations and warranties of the Acquired Fund contained in
this Agreement shall be true and correct in all material respects as of the date
hereof and, except as they may be affected by the transactions contemplated by
this Agreement, as of the Closing Date with the same force and effect as if made
on and as of the Closing Date;

      7.2 The Acquired Fund shall have delivered to the Surviving Fund the
Statement of Assets and Liabilities, together with a list of the Acquired Fund's
portfolio securities showing the federal income tax bases of and holding periods
for such securities as of the Closing Date, certified by the Treasurer or
Assistant Treasurer of the Acquired Fund;

      7.3 The Acquired Fund shall have delivered to Trust IX on the Closing Date
a certificate executed in its name by its President, Vice President, Secretary
or Assistant Secretary and Treasurer or Assistant Treasurer, in form and
substance satisfactory to the Surviving Fund and dated as of the Closing Date,
to the effect that the representations and warranties of the Acquired Fund made
in this Agreement are true and correct at and as of the Closing Date, except as
they may be affected by the transactions contemplated by this Agreement, and
that the Acquired Fund shall have complied with all covenants and agreements and
satisfied all conditions on its part to be performed or satisfied under this
Agreement at or prior to the Closing Date, and as to such other matters as the
Surviving Fund shall reasonably request;

      7.4 Trust IX shall have received on the Closing Date a favorable opinion
from Susan S. Newton, Associate General Counsel and Senior Vice President of
MFS, the Acquired Fund's investment adviser, dated as of the Closing Date, in a
form satisfactory to the Surviving Fund to the effect that:

        (a)   The Acquired Fund is a business trust duly organized and validly
              existing under the laws of The Commonwealth of Massachusetts and
              has power to own all of its properties and assets and to carry on
              its business as


              currently conducted, as described in the Registration Statement;

        (b)   this Agreement has been duly authorized, executed and delivered by
              the Acquired Fund and, assuming that the Surviving Fund prospectus
              contained in the Registration Statement, the Registration
              Statement and the Proxy Statement comply with the Acts, and
              assuming due authorization, execution and delivery of this
              Agreement by the Surviving Fund, is a valid and binding obligation
              of the Acquired Fund enforceable against the Acquired Fund in
              accordance with its terms, except as the same may be limited by
              bankruptcy, insolvency, reorganization or other similar laws
              affecting the enforcement of creditors' rights generally and other
              equitable principles;

              The Acquired Fund has power to sell, assign, convey, transfer and
              deliver the assets contemplated hereby and, upon consummation of
              the transactions contemplated hereby in accordance with the terms
              of this Agreement, the Acquired Fund will have duly, sold,
              assigned, conveyed, transferred and delivered such assets to the
              Surviving Fund.

        (c)   the execution and delivery of this Agreement did not, and the
              consummation of the transactions contemplated hereby will not,
              violate the Acquired Fund's Declaration of Trust or By-Laws, or
              any material provision of any agreement (known to such counsel) to
              which the Acquired Fund is a party or by which it is bound or, to
              the knowledge of such counsel, result in the acceleration of any
              obligation or the imposition of any penalty, under any agreement,
              judgment or decree to which the Surviving Fund is a party or by
              which it is bound;

        (d)   to the knowledge of such counsel, no consent, approval,
              authorization or order of any court or governmental authority is
              required for the consummation by the Acquired Fund of the
              transactions contemplated herein, except such as have been
              obtained under the Acts and such as may be required under state
              securities laws;

        (e)   the descriptions in the Proxy Statement of statutes, legal and
              governmental proceedings and contracts and other documents, if
              any, only insofar as they relate to the Acquired Fund, are
              accurate in all material respects;

        (f)   to the knowledge of such counsel, there are no legal or
              governmental proceedings relating to the Acquired Fund existing on
              or before the date of mailing the Proxy Statement or the Closing
              Date required to be described in the Proxy Statement that are not
              described as required;

        (g)   assuming that consideration therefor of not less than the net
              asset value and the par value thereof has been paid, and assuming
              that such


              shares were issued in  accordance  with the terms of the Acquired
              Fund's registration  statement or any amendment thereto in effect
              at the time of such issuance,  all issued and outstanding  shares
              of the Acquired Fund are validly issued and outstanding and fully
              paid and  nonassessable  (except  as  described  in the  Acquired
              Fund's   current   prospectus   and   statement   of   additional
              information);

        (h)   to the knowledge of such counsel, the Acquired Fund is a duly
              registered investment company and, to the knowledge of such
              counsel, its registration with the Commission as an investment
              company under the 1940 Act is in full force and effect; and

        (i)   except as may have been previously disclosed by the Acquired Fund,
              in writing, to the knowledge of such counsel, no litigation or
              administrative proceeding or investigation of or before any court
              or governmental body is currently pending or threatened as to the
              Acquired Fund or any of the Acquired Fund's properties or assets,
              and the Acquired Fund is not a party to or subject to the
              provisions of any order, decree or judgment of any court or
              governmental body that materially and adversely affects its
              business or its ability to consummate the transactions
              contemplated hereby.

              Such opinion shall also state that while such counsel has not
              verified, and is not passing upon and does not assume any
              responsibility for the accuracy, completeness or fairness of the
              statements contained in the Proxy Statement, she generally
              reviewed and discussed certain of such statements with certain
              officers of the Acquired Fund and that in the course of such
              review and discussion no facts came to the attention of such
              counsel that led her to believe that, on the effective date of the
              Registration Statement or on the date of the Meeting and only
              insofar as such statements relate to the Acquired Fund, the Proxy
              Statement contained any untrue statement of a material fact or
              omitted to state a material fact necessary in order to make the
              statements made therein, in the light of the circumstances under
              which they were made, not misleading. Such opinion may state that
              such counsel does not express any opinion or belief as to the
              financial statements or other financial or statistical data, or as
              to the information relating to Trust IX or the Surviving Fund,
              contained in the Proxy Statement or Registration Statement. Such
              opinion may also state that such opinion is solely for the benefit
              of the Trust IX, its Board of Trustees and its officers, and the
              Surviving Fund. Such opinion shall also include such other matters
              incidental to the transaction contemplated hereby as the Surviving
              Fund may reasonably request; and

         7.5 The assets of the Acquired Fund to be acquired by the Surviving
Fund will include no assets which the Surviving Fund, by reason of limitations


contained in Trust IX's Declaration of Trust or of investment restrictions
disclosed in the Surviving Fund's prospectus and statement of additional
information in effect on the Closing Date, may not properly acquire.

8. Further Conditions Precedent to Obligations of Trust IX and the Acquired Fund

      The obligations of the Acquired Fund hereunder are, at the option of Trust
IX, and the obligations of the Trust IX hereunder are, at the option of the
Acquired Fund, each subject to the further conditions that on or before the
Closing Date:

      8.1 This Agreement and the transactions contemplated herein shall have
been approved by the requisite vote of the holders of outstanding Acquired Fund
Shares in accordance with the provisions of the Acquired Fund's Declaration of
Trust and By-Laws and the 1940 Act and the rules thereunder, and certified
copies of the resolutions evidencing such approval shall have been delivered to
the Surviving Fund;

      8.2 On the Closing Date no action, suit or other proceeding shall be
pending before any court or governmental agency in which it is sought to
restrain or prohibit, or obtain damages or other relief in connection with, this
Agreement or the transactions contemplated herein;

      8.3 All consents of other parties and all other consents, orders and
permits of federal, state and local regulatory authorities (including those of
the Commission and of state "Blue Sky" and other securities authorities,
including "no-action" positions of such federal or state authorities) deemed
necessary by Trust IX, on behalf of the Surviving Fund, or the Acquired Fund to
permit consummation, in all material respects, of the transactions contemplated
hereby shall have been obtained, except where failure to obtain any such
consent, order or permit would not involve a risk of a material adverse effect
on the assets or properties of either Fund, provided that either Trust IX, on
behalf of the Surviving Fund, or the Acquired Fund may waive any such conditions
for itself, respectively;

      8.4 The Registration Statement shall have become effective under the 1933
Act and, as of the Closing Date, no stop orders suspending the effectiveness
thereof shall have been issued, and, to the best knowledge of the parties
hereto, no investigation or proceeding for that purpose shall have been
instituted or be pending, threatened or contemplated under the 1933 Act;

      8.5 The Acquired Fund shall have declared to Acquired Fund shareholders of
record on or prior to the Closing Date a dividend or dividends which together
with all previous such dividends shall have the effect of distributing to the
Acquired Fund shareholders (a) all of the excess of (i) the Acquired Fund's
investment income excludable from gross income under section 103(a) of the


Code over (ii) the Acquired Fund's deductions  disallowed under sections 265 and
171(a)(2) of the Code, (b) all of the Acquired Fund's investment company taxable
income as defined in section  852 of the Code,  (computed  in each case  without
regard to any deduction for dividends  paid), and (c) all of the Acquired Fund's
net realized  capital gain (after  reduction for any capital loss  carryover) in
each case for both the taxable  year  ending on December  31, 2005 and the short
taxable year beginning on January 1, 2006 and ending on the Closing Date;

      8.6 The Acquired Fund and Trust IX shall have received an opinion of Ropes
& Gray LLP ("Tax Counsel"), reasonably satisfactory to them, as to the federal
income tax consequences mentioned below (the "Tax Opinion"). In rendering the
Tax Opinion, Tax Counsel may rely as to factual matters, exclusively and without
independent verification, on the representations and warranties made in this
Agreement, which Tax Counsel may treat as representations and warranties made to
it, and in separate letters addressed to Tax Counsel and certificates delivered
pursuant to this Agreement. The Tax Opinion shall be substantially to the effect
that, although not free from doubt, based on the existing provisions of the
Code, Treasury regulations, current administrative rules, and court decisions,
on the basis of the facts and assumptions stated therein and conditioned on
consummation of the Reorganization in accordance with this Agreement, for
federal income tax purposes:

(a)        the Reorganization will constitute a reorganization within the
           meaning of Section 368(a) of the Code, and Surviving Fund and
           Acquired Fund each will be a "party to a reorganization" within the
           meaning of Section 368(b) of the Code;

(b)        no gain or loss will be recognized by Surviving Fund upon the receipt
           of the Assets of Acquired Fund in exchange for Reorganization Shares
           and the assumption by Surviving Fund of the Liabilities of Acquired
           Fund;

(c)        the basis in the hands of Surviving Fund of the Assets of Acquired
           Fund transferred to Surviving Fund in the Transaction will be the
           same as the basis of such Assets in the hands of Acquired Fund
           immediately prior to the transfer;

(d)        the holding periods of the Assets of Acquired Fund in the hands of
           Surviving Fund will include the periods during which such Assets were
           held by Acquired Fund;

(e)        no gain or loss will be recognized by Acquired Fund Shareholders upon
           the transfer of Acquired Fund's Assets to Surviving Fund in exchange
           for Reorganization Shares and the assumption by Surviving Fund of the
           Liabilities of Acquired Fund, or upon the distribution of
           Reorganization Shares by Acquired Fund to its shareholders in
           liquidation pursuant to this Agreement;


(f)        no gain or loss will be recognized by Acquired Fund Shareholders upon
           the exchange of their Acquired Fund shares for Reorganization Shares;

(g)        the aggregate basis of Reorganization Shares that an Acquired Fund
           Shareholder receives in connection with the Reorganization will be
           the same as the aggregate basis of his or her Acquired Fund shares
           exchanged therefore;

(h)        an Acquired Fund Shareholder's holding period for his or her
           Reorganization Shares will be determined by including the period for
           which he or she held the Acquired Fund shares exchanged therefore,
           provided that he or she held such Acquired Fund shares as capital
           assets; and

(i)        the Surviving Fund will succeed to and take into account the items of
           the Acquired Fund described in Section 381(c) of the Code, subject to
           the conditions and limitations specified in Sections 381, 382, 383
           and 384 of the Code and the regulations thereunder.

     Notwithstanding the above, the Tax Opinion will state that no opinion is
expressed as to the effect of the Reorganization on the Funds or any Acquired
Fund Shareholder with respect to any Asset as to which any unrealized gain or
loss is required to be recognized for federal income tax purposes at the end of
a taxable year (or on the termination or transfer thereof) under federal income
tax principles. Trust IX and the Acquired Fund each agrees to make and provide
additional representations to Tax Counsel with respect to the Surviving Fund and
the Acquired Fund, respectively, that are reasonably necessary to enable Tax
Counsel to deliver the Tax Opinion. Notwithstanding anything herein to the
contrary, Trust IX and the Acquired Fund may not waive in any material respect
the condition set forth in this paragraph 8.6.

     8.7 The Board of Trustees of each Fund shall have determined, with respect
to each Fund, that the Reorganization is in the best interests of the Fund and
is not dilutive of the interests of the Fund's existing shareholders and, based
on such determinations, shall have approved this Agreement and the transactions
contemplated thereby.

9.   Brokerage Fees and Expenses; Contingent Deferred Sales Charges; Certain Tax
     Matters; Certain Records

      9.1 Trust IX and the Acquired Fund each represents and warrants to the
other that there are no brokers or finders entitled to receive any payments from
either party to this Agreement in connection with the transactions provided for
herein.

      9.2 Each Fund will be liable for its own expenses incurred in connection
with entering into and carrying out the provisions of this Agreement, whether or
not


the Reorganization is consummated.

      9.3 Reorganization Shares issued in connection with the Reorganization
will not be subject to any initial sales charge; however, if any Acquired Fund
Shares are at the Closing Date subject to a contingent deferred sales charge (a
"CDSC"), the Surviving Fund CDSC schedule and the methodology of aging such
shares as set forth in the Surviving Fund Prospectus will apply to the
Reorganization Shares issued in respect of such Acquired Fund Shares, and the
Reorganization Shares received by Acquired Fund Shareholders pursuant to
paragraph 1.4 hereof will, for purposes of calculating the CDSC, if applicable,
and determining when the Surviving Fund's Class B shares will convert to Class A
shares of the Surviving Fund, be treated as if purchased on the original date of
purchase of such Acquired Fund Shares.

      9.4 The Acquired Fund agrees that it or its designee shall file or furnish
all federal, state and other tax returns, forms and reports, including
information returns and payee statements, if applicable, of the Acquired Fund
required by law to be filed or furnished by such dates as required by law to be
filed or furnished, and shall provide such other federal and state tax
information to shareholders of the Acquired Fund as has been customarily
provided by the Acquired Fund, all with respect to the fiscal period commencing
January 1, 2006 and ending on the Closing Date.

      9.5 The Acquired Fund agrees that it or its designee shall deliver to
Trust IX, on behalf of the Surviving Fund, on the Closing Date or as soon
thereafter as possible: (a) Acquired Fund shareholder statements and tax forms
(i.e., Forms 1099) for the taxable years ended December 31, 2004 and December
31, 2005, and the short taxable year commencing on January 1, 2006 and ending on
the Closing Date (all on microfilm or microfiche, if available); (b) detailed
records indicating the status of all certificates representing ownership of the
Acquired Fund Shares issued since inception of the Acquired Fund (e.g.,
indicating whether the certificates are outstanding or cancelled); and (c) for
each Acquired Fund Shareholder, a record indicating the dollar amount of such
shareholder's Acquired Fund Share holdings as of such date representing that
portion of such holdings subject to a CDSC as of such date and that portion of
such holdings not subject to a CDSC as of such date, together with such other
information with respect thereto as the Surviving Fund may reasonably request.

10.      Entire Agreement

      Trust IX and the Acquired Fund agree that neither party has made any
representation, warranty or covenant not set forth herein or referred to in
Article 4 hereof or required in connection with paragraph 8.6 hereof and that
this Agreement constitutes the entire agreement between the parties.

11. Termination


      11.1 This Agreement may be terminated by the mutual agreement of Trust IX
and the Acquired Fund. In addition, either party may at its option terminate
this Agreement unilaterally at or prior to the Closing Date because of:

       (a)    a material breach by the other of any representation, warranty or
              agreement contained herein to be performed at or prior to the
              Closing Date; or

       (b)    a condition herein expressed to be precedent to the obligations of
              the terminating party that has not been met and that reasonably
              appears will not or cannot be met.

      11.2 In the event of any such termination, there shall be no liability for
damages on the part of either Trust IX or the Acquired Fund, or their respective
trustees or officers, to the other party or its trustees or officers, but each
shall bear the expenses incurred by it incidental to the preparation and
carrying out of this Agreement.

12. Amendments

      This Agreement may be amended, modified or supplemented in such manner as
may be mutually agreed upon in writing by the authorized officers of the
Acquired Fund and Trust IX; provided, however, that following the Meeting, no
such amendment may have the effect of changing the provisions for determining
the number of Reorganization Shares to be issued to the Acquired Fund
Shareholders under this Agreement to their detriment without their further
approval; and provided further that nothing contained in this Article 12 shall
be construed to prohibit the parties from amending this Agreement to change the
Closing Date or the Valuation Date.

13. Notices

      Any notice, report, statement or demand required or permitted by any
provisions of this Agreement shall be in writing and shall be personally
delivered or given by prepaid telegraph, telecopy or certified mail addressed to
Trust IX or the Acquired Fund (as applicable), 500 Boylston Street, Boston,
Massachusetts 02116, Attention: Assistant Secretary.

14. Miscellaneous

      14.1 The article and paragraph headings contained in this Agreement are
for reference purposes only and shall not affect in any way the meaning or
interpretation of this Agreement.

      14.2 This Agreement may be executed in any number of counterparts, each


of which shall be deemed an original.

      14.3 This Agreement shall be governed by and construed in accordance with
the laws of The Commonwealth of Massachusetts; provided that, in the case of any
conflict between such laws and the federal securities laws, the latter shall
govern.

      14.4 This Agreement shall bind and inure to the benefit of the parties
hereto and their respective successors and assigns, but no assignment or
transfer hereof or of any rights or obligations hereunder shall be made by any
party without the written consent of the other party. Nothing herein expressed
or implied is intended or shall be construed to confer upon or give any person,
firm or corporation, other than the parties hereto and their respective
successors and assigns, any rights or remedies under or by reason of this
Agreement.

      14.5 A copy of Trust IX's Declaration of Trust is on file with the
Secretary of State of The Commonwealth of Massachusetts. The Acquired Fund
acknowledges that the obligations of or arising out of this instrument are not
binding upon any of the Surviving Fund's trustees, officers, employees, agents
or shareholders individually, but are binding solely upon the assets and
property of the Surviving Fund in accordance with its proportionate interest
hereunder. The Acquired Fund further acknowledges that the assets and
liabilities of each series of the Surviving Fund are separate and distinct and
that the obligations of or arising out of this instrument are binding solely
upon the assets or property of the Surviving Fund.

      14.6 A copy of the Acquired Fund's Declaration of Trust is on file with
the Secretary of State of The Commonwealth of Massachusetts. Trust IX
acknowledges that the obligations of or arising out of this instrument are not
binding upon any of the Acquired Fund's trustees, officers, employees, agents or
shareholders individually, but are binding solely upon the assets and property
of the Acquired Fund in accordance with its proportionate interest hereunder.

      14.7 Notwithstanding Article 12 of this Agreement, but subject to the
first proviso contained therein, either party to this Agreement, with the
consent of its President, Vice President, Secretary or Assistant Secretary, may
waive any condition (other than that contained in paragraph 8.6 hereof) or
covenant to which the other party is subject or may modify such condition or
covenant in a manner deemed appropriate by any such officer.




      IN WITNESS WHEREOF, each of the parties hereto has caused this Agreement
to be executed by a duly authorized officer thereof.

                            MFS SERIES TRUST IX, on its
                            behalf and on behalf of MFS
                            LIMITED MATURITY FUND, one
                            of its series By:

                            SUSAN S. NEWTON
                            -----------------------------------
                            Susan S. Newton
                            Assistant Secretary

                            MFS GOVERNMENT LIMITED MATURITY FUND, on its behalf

                            By:

                            MARIA F. DWYER
                            -----------------------------------
                            Maria F. Dwyer
                            President