MFS SERIES TRUST III
497, 1995-03-10
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<PAGE>
<TABLE>
<CAPTION>
<S>                                                                 <C>
  MFS(R) TOTAL RETURN FUND                                          MFS(R) ALABAMA MUNICIPAL BOND FUND
  MASSACHUSETTS INVESTORS GROWTH STOCK FUND                         MFS(R) ARKANSAS MUNICIPAL BOND FUND
  MFS(R) GROWTH OPPORTUNITIES FUND                                  MFS(R) CALIFORNIA MUNICIPAL BOND FUND
  MFS(R) EMERGING GROWTH FUND                                       MFS(R) FLORIDA MUNICIPAL BOND FUND
  MFS(R) CAPITAL GROWTH FUND                                        MFS(R) GEORGIA MUNICIPAL BOND FUND
  MFS(R) INTERMEDIATE INCOME FUND                                   MFS(R) LOUISIANA MUNICIPAL BOND FUND
  MFS(R) GOLD & NATURAL RESOURCES FUND                              MFS(R) MARYLAND MUNICIPAL BOND FUND
  MFS(R) MANAGED SECTORS FUND                                       MFS(R) MASSACHUSETTS MUNICIPAL BOND FUND
  MFS(R) VALUE FUND                                                 MFS(R) MISSISSIPPI MUNICIPAL BOND FUND
  MFS(R) UTILITIES FUND                                             MFS(R) NEW YORK MUNICIPAL BOND FUND
  MFS(R) WORLD EQUITY FUND                                          MFS(R) NORTH CAROLINA MUNICIPAL BOND FUND
  MFS(R) WORLD TOTAL RETURN FUND                                    MFS(R) PENNSYLVANIA MUNICIPAL BOND FUND
  MFS(R) BOND FUND                                                  MFS(R) SOUTH CAROLINA MUNICIPAL BOND FUND
  MFS(R) LIMITED MATURITY FUND                                      MFS(R) TENNESSEE MUNICIPAL BOND FUND
  MFS(R) GOVERNMENT MORTGAGE FUND                                   MFS(R) TEXAS MUNICIPAL BOND FUND
  MFS(R) GOVERNMENT LIMITED MATURITY FUND                           MFS(R) VIRGINIA MUNICIPAL BOND FUND
  MFS(R) GOVERNMENT SECURITIES FUND                                 MFS(R) WASHINGTON MUNICIPAL BOND FUND
  MFS(R) HIGH INCOME FUND                                           MFS(R) WEST VIRGINIA MUNICIPAL BOND FUND
  MFS(R) STRATEGIC INCOME FUND                                      MFS(R) MUNICIPAL LIMITED MATURITY FUND
  MFS(R) WORLD GOVERNMENTS FUND                                     MFS(R) MUNICIPAL BOND FUND
  MFS(R) WORLD GROWTH FUND                                          MFS(R) MUNICIPAL INCOME FUND
  MFS(R) OTC FUND                                                   MFS(R) RESEARCH FUND
  MFS(R) MUNICIPAL HIGH INCOME FUND                                 MFS(R) WORLD ASSET ALLOCATION FUND
  MASSACHUSETTS INVESTORS TRUST
</TABLE>

                      SUPPLEMENT TO THE CURRENT PROSPECTUS

During the  period  from  January 3, 1995  through  April 28,  1995 (the  "Sales
Period") (unless extended by MFS Fund  Distributors,  Inc.  ("MFD"),  the funds'
principal  underwriter),  MFD will pay A. G.  Edwards  and Sons,  Inc.,  ("A. G.
Edwards") 100% of the applicable sales charge on sales of Class A shares of each
of the funds  listed  above (the  "Funds")  sold for  investment  in  Individual
Retirement Accounts ("IRAs") (excluding SEP-IRAs).  In addition, MFD will pay A.
G. Edwards an additional commission equal to 0.50% of the net asset value of all
of the  Class B shares  of the  Funds  sold by A. G.  Edwards  during  the Sales
Period.

                THE DATE OF THIS SUPPLEMENT IS JANUARY 3, 1995.

                                                              MFS-16AG-1/95/3.5M
<PAGE>
<TABLE>
<CAPTION>
<S>                                                                      <C>
  MFS(R) MANAGED SECTORS FUND                                            MFS(R) MUNICIPAL LIMITED MATURITY FUND
  MFS(R) CASH RESERVE FUND                                               MFS(R) ALABAMA MUNICIPAL BOND  FUND
  MFS(R) WORLD ASSET ALLOCATION FUND                                     MFS(R) ARKANSAS MUNICIPAL BOND FUND
  MFS(R) EMERGING GROWTH FUND                                            MFS(R) CALIFORNIA MUNICIPAL BOND FUND
  MFS(R) CAPITAL GROWTH FUND                                             MFS(R) FLORIDA MUNICIPAL BOND FUND
  MFS(R) GOLD & NATURAL RESOURCES FUND                                   MFS(R) GEORGIA MUNICIPAL BOND FUND
  MFS(R) INTERMEDIATE INCOME FUND                                        MFS(R) LOUISIANA MUNICIPAL BOND FUND
  MFS(R) HIGH INCOME FUND                                                MFS(R) MARYLAND MUNICIPAL BOND FUND
  MFS(R) MUNICIPAL HIGH INCOME FUND                                      MFS(R) MASSACHUSETTS MUNICIPAL BOND FUND
  MFS(R) MONEY MARKET FUND                                               MFS(R) MISSISSIPPI MUNICIPAL BOND FUND
  MFS(R) GOVERNMENT MONEY MARKET FUND                                    MFS(R) NEW YORK MUNICIPAL BOND FUND
  MFS(R) MUNICIPAL BOND FUND                                             MFS(R) NORTH CAROLINA MUNICIPAL BOND FUND
  MFS(R) OTC FUND                                                        MFS(R) PENNSYLVANIA MUNICIPAL BOND FUND
  MFS(R) TOTAL RETURN FUND                                               MFS(R) SOUTH CAROLINA MUNICIPAL BOND FUND
  MFS(R) RESEARCH FUND                                                   MFS(R) TENNESSEE MUNICIPAL BOND FUND
  MFS(R) WORLD TOTAL RETURN FUND                                         MFS(R) TEXAS MUNICIPAL BOND FUND
  MFS(R) UTILITIES FUND                                                  MFS(R) VIRGINIA MUNICIPAL BOND FUND
  MFS(R) WORLD EQUITY FUND                                               MFS(R) WASHINGTON MUNICIPAL BOND FUND
  MFS(R) WORLD GOVERNMENTS FUND                                          MFS(R) WEST VIRGINIA MUNICIPAL BOND FUND
  MFS(R) VALUE FUND                                                      MFS(R) GROWTH OPPORTUNITIES FUND
  MFS(R) STRATEGIC INCOME FUND                                           MFS(R) GOVERNMENT MORTGAGE FUND
  MFS(R) WORLD GROWTH FUND                                               MFS(R) GOVERNMENT SECURITIES FUND
  MFS(R) BOND FUND                                                       MASSACHUSETTS INVESTORS GROWTH STOCK FUND
  MFS(R) LIMITED MATURITY FUND                                           MFS(R) GOVERNMENT LIMITED MATURITY FUND
                                                                         MASSACHUSETTS INVESTORS TRUST
</TABLE>
                      SUPPLEMENT TO THE CURRENT PROSPECTUS

     Effective as of January 1, 1995, MFS Fund  Distributors,  Inc.  ("MFD") has
replaced MFS Financial Services,  Inc. ("FSI") as the Fund's  distributor.  Both
MFD and FSI are wholly-owned  subsidiaries of Massachusetts  Financial  Services
Company ("MFS"), the Fund's investment adviser.
                -----------------------------------------------

     Class A shares of the Fund may be  purchased  at net asset value by certain
retirement plans subject to the Employee Retirement Income Security Act of 1974,
as amended,  subject to the  following:

     (i)  The sponsoring  organization  must  demonstrate to the satisfaction of
          MFD that either (a) the  employer has at least 25 employees or (b) the
          aggregate  purchases by the  retirement  plan of Class A shares of the
          Funds will be in an amount of at least  $250,000  within a  reasonable
          period of time, as determined by MFD in its sole discretion; and
     (ii) A contingent deferred  sales charge  of 1%  will  be  imposed  on such
          purchases in the event of certain  redemption  transactions  within 12
          months following such purchases.
                -----------------------------------------------

    Class A shares  may be sold at net  asset  value,  subject  to  appropriate
documentation,  through a dealer where the amount invested represents redemption
proceeds  from  a  registered   open-end   management   investment  company  not
distributed or managed by MFD or its affiliates if: (i) the redeemed shares were
subject to an initial  sales charge or a deferred  sales charge  (whether or not
actually imposed);  (ii) such redemption has occurred no more than 90 days prior
to the  purchase of Class A shares of the Fund;  and (iii) the Fund,  MFD or its
affiliates  have not agreed  with such  company or its  affiliates,  formally or
informally,  to sell  Class A shares at net  asset  value or  provide  any other
incentive with respect to such redemption and sale.
                -----------------------------------------------

     Class  A  shares  of the  Fund  may be  purchased  at net  asset  value  by
retirement  plans  whose  third  party   administrators  have  entered  into  an
administrative  services  agreement with MFD or one or more of its affiliates to
perform  certain  administrative   services,   subject  to  certain  operational
requirements  specified  from  time  to  time  by  MFD or  one  or  more  of its
affiliates.
                -----------------------------------------------
                                                                          (Over)
<PAGE>
     Class A  shares  of the  Fund  (except  of the  MFS  municipal  bond  funds
identified  above)  may be  purchased  at net asset  value by  retirement  plans
qualified  under Section 401(k) of the Code through certain  broker-dealers  and
other financial institutions which have entered into an agreement with MFD which
includes  certain  minimum size  qualifications  for such  retirement  plans and
provides that the  broker-dealer  or other  financial  institution  will perform
certain administrative services with respect to the plan's account.

                -----------------------------------------------

     The CDSC on Class A and Class B shares will be waived upon  redemption by a
retirement  plan where the  redemption  proceeds are used to pay expenses of the
retirement plan or certain  expenses of  participants  under the retirement plan
(e.g.,  participant  account fees),  provided that the retirement plan's sponsor
subscribes  to  the  MFS   Fundamental   401(k)   Plan(sm)  or  another  similar
recordkeeping   system  made  available  by  MFS  Service   Center,   Inc.  (the
"Shareholder Servicing Agent").

                -----------------------------------------------

     The CDSC on Class A and B  shares  will be  waived  upon  the  transfer  of
registration  from shares held by a  retirement  plan  through a single  account
maintained by the  Shareholder  Servicing  Agent to multiple Class A and B share
accounts, respectively,  maintained by the Shareholder Servicing Agent on behalf
of individual  participants in the retirement plan, provided that the retirement
plan's  sponsor  subscribes to the MFS  Fundamental  401(k)  Plan(sm) of another
similar recordkeeping system made available by the Shareholder Servicing Agent.

                -----------------------------------------------

     The applicability of a CDSC will be unaffected by exchanges or transfers of
registration,  except that,  with respect to transfers of registration to an IRA
rollover account, the CDSC will be waived if the shares being reregistered would
have been eligible for a CDSC waiver had they been redeemed.

                -----------------------------------------------

     The current Prospectus  discloses that "Class A shares of the Fund may also
be purchased at net asset value where the purchase is in an amount of $3 million
or more and where the dealer and FSI enter into an agreement in which the dealer
agrees to return any  commission  paid to it on the sale (or a pro rata  portion
thereof) as described above if the shareholder  redeems his or her shares within
one year of purchase. (Shareholders who purchase shares at NAV pursuant to these
conditions  are called ("$3 Million  Shareholders")."  This policy is terminated
effective as of the date of this Supplement and the  above-referenced  language,
and  all  references  to  "$3  Million   Shareholders,"  are  deleted  from  the
Prospectus.
                -----------------------------------------------

     From time to time, MFD may pay dealers 100% of the applicable  sales charge
on sales of Class A shares of certain specified Funds sold by such dealer during
a specified sales period.  In addition,  MFD or its affiliates may, from time to
time, pay dealers an additional commission equal to 0.50% of the net asset value
of all of the Class B shares of  certain  specified  Funds  sold by such  dealer
during a specified sales period.

                -----------------------------------------------

     If a  shareholder  has elected to receive  dividends  and/or  capital  gain
distributions  in cash and the  postal or other  delivery  service  is unable to
deliver  checks to the  shareholder's  address  of  record,  such  shareholder's
distribution  option will  automatically  be converted to reinvest all dividends
and other distributions reinvested in additional shares.

                -----------------------------------------------

     From  time to time,  MFS  may  direct  certain  portfolio  transactions  to
broker-dealer  firms which,  in turn, have agreed to pay a portion of the Fund's
operating expenses (e.g., fees charged by the custodian of the Fund's assets).

                THE DATE OF THIS SUPPLEMENT IS JANUARY 13,1995.

                                                                MFS-16-1/95/605M
<PAGE>
<TABLE>
<CAPTION>
<S>                                                               <C>
  MASSACHUSETTS INVESTORS TRUST                                   MFS(R) WORLD TOTAL RETURN FUND
  MASSACHUSETTS INVESTORS GROWTH STOCK FUND                       MFS(R) MUNICIPAL BOND FUND
  MFS(R) CAPITAL GROWTH FUND                                      MFS(R) MUNICIPAL HIGH INCOME FUND
  MFS(R) EMERGING GROWTH FUND                                     MFS(R) MUNICIPAL INCOME FUND
  MFS(R) GOLD & NATURAL RESOURCES FUND                            MFS(R) ALABAMA MUNICIPAL BOND FUND
  MFS(R) GROWTH OPPORTUNITIES FUND                                MFS(R) ARKANSAS MUNICIPAL BOND FUND
  MFS(R) MANAGED SECTORS FUND                                     MFS(R) CALIFORNIA MUNICIPAL BOND FUND
  MFS(R) OTC FUND                                                 MFS(R) FLORIDA MUNICIPAL BOND FUND
  MFS(R) RESEARCH FUND                                            MFS(R) GEORGIA MUNICIPAL BOND FUND
  MFS(R) VALUE FUND                                               MFS(R) LOUISIANA MUNICIPAL BOND FUND
  MFS(R) TOTAL RETURN FUND                                        MFS(R) MARYLAND MUNICIPAL BOND FUND
  MFS(R) UTILITIES FUND                                           MFS(R) MASSACHUSETTS MUNICIPAL BOND FUND
  MFS(R) BOND FUND                                                MFS(R) MISSISSIPPI MUNICIPAL BOND FUND
  MFS(R) GOVERNMENT MORTGAGE FUND                                 MFS(R) NEW YORK MUNICIPAL BOND FUND
  MFS(R) GOVERNMENT SECURITIES FUND                               MFS(R) NORTH CAROLINA MUNICIPAL BOND FUND
  MFS(R) HIGH INCOME FUND                                         MFS(R) PENNSYLVANIA MUNICIPAL BOND FUND
  MFS(R) INTERMEDIATE INCOME FUND                                 MFS(R) SOUTH CAROLINA MUNICIPAL BOND FUND
  MFS(R) STRATEGIC INCOME FUND                                    MFS(R) TENNESSEE MUNICIPAL BOND FUND
  MFS(R) GOVERNMENT LIMITED MATURITY FUND                         MFS(R) TEXAS MUNICIPAL BOND FUND
  MFS(R) LIMITED MATURITY FUND                                    MFS(R) VIRGINIA MUNICIPAL BOND FUND
  MFS(R) MUNICIPAL LIMITED MATURITY FUND                          MFS(R) WASHINGTON MUNICIPAL BOND FUND
  MFS(R) WORLD EQUITY FUND                                        MFS(R) WEST VIRGINIA MUNICIPAL BOND FUND
  MFS(R) WORLD GOVERNMENTS FUND                                   MFS(R) WORLD ASSET ALLOCATION FUND
  MFS(R) WORLD GROWTH FUND
</TABLE>

                      SUPPLEMENT TO THE CURRENT PROSPECTUS

During the period  from  February  1, 1995  through  April 14,  1995 (the "Sales
Period") (unless extended by MFS Fund  Distributors,  Inc.  ("MFD"),  the Funds'
distributor),  MFD will pay Corelink  Financial Inc.  ("Corelink") an additional
commission  equal to 0.10% of the gross  commissonable  sales for Class A shares
and Class B shares and the net asset value for Class C shares (if applicable) of
the Funds sold by Corelink during the Sales Period.

                THE DATE OF THIS SUPPLEMENT IS FEBRUARY 1, 1995.



                                                                MFS-16CL-2/95/5M
<PAGE>
                                           PROSPECTUS
MFS(R) MUNICIPAL                           June 1, 1994
HIGH INCOME FUND                           Class A Shares of Beneficial Interest
(A member of the MFS Family of Funds(R))   Class B Shares of Beneficial Interest
                                                                            Page
1. The Fund ...............................................................    2
2. Expense Summary ........................................................    3
3. Condensed Financial Information ........................................    4
4. Investment Objective and Policies ......................................    4
5. Risk Factors ...........................................................    9
6. Management of the Fund .................................................   10
7. Information Concerning Shares of the Fund ..............................   11
       Purchases ..........................................................   11
       Exchanges ..........................................................   16
       Redemptions and Repurchases ........................................   16
       Distribution Plan ..................................................   18
       Distributions ......................................................   19
       Tax Status .........................................................   19
       Net Asset Value ....................................................   20
       Description of Shares, Voting Rights and Liabilities ...............   20
       Performance Information ............................................   20
8. Shareholder Services ...................................................   21
       Appendix A .........................................................   23
       Appendix B .........................................................   23
       Appendix C .........................................................   27

THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES  AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE  SECURITIES
          AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
         PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY
            REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

MFS MUNICIPAL HIGH INCOME FUND
500 Boylston Street, Boston, MA 02116  (617) 954-5000

The  investment  objective of MFS Municipal  High Income Fund (the "Fund") is to
provide high current  income  exempt from federal  income  taxes.  The Fund is a
non-diversified  series of MFS  Series  Trust  III (the  "Trust"),  an  open-end
investment  company.  The Fund seeks to achieve this  objective by investing its
assets  primarily in municipal  bonds and notes which may be of medium and lower
quality (see "Investment Objective and Policies").

TAX-EXEMPT  SECURITIES  OFFERING  THE HIGH  CURRENT  INCOME  SOUGHT  BY THE FUND
(COMMONLY  KNOWN AS "JUNK BONDS") ARE  ORDINARILY IN THE MEDIUM AND LOWER RATING
CATEGORIES OF RECOGNIZED  RATING AGENCIES (HIGH RISK  SECURITIES) OR ARE UNRATED
AND,  THEREFORE,  GENERALLY  INVOLVE  GREATER  VOLATILITY  OF PRICE  AND RISK OF
PRINCIPAL AND INCOME THAN SECURITIES IN THE HIGHER RATING  CATEGORIES (SEE "RISK
FACTORS"). ACCORDINGLY, AN INVESTMENT IN THE FUND MAY NOT BE APPROPRIATE FOR ALL
INVESTORS.

The Fund's  investment  adviser  and  distributor  are  Massachusetts  Financial
Services Company and MFS Financial Services, Inc.,  respectively,  both of which
are located at 500 Boylston Street, Boston, Massachusetts 02116.

SHARES OF THE FUND ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR ENDORSED
BY, ANY BANK AND THE SHARES ARE NOT  FEDERALLY  INSURED BY THE  FEDERAL  DEPOSIT
INSURANCE CORPORATION, THE FEDERAL RESERVE BOARD, OR ANY OTHER AGENCY.

This Prospectus  sets forth  concisely the information  concerning the Trust and
the Fund that a prospective investor ought to know before investing.  The Trust,
on behalf of the Fund,  has filed with the  Securities  and Exchange  Commission
(the "SEC") a Statement of  Additional  Information,  dated June 1, 1994,  which
contains  more  detailed  information  about  the  Trust  and  the  Fund  and is
incorporated  into  this  Prospectus  by  reference.  See page 22 for a  further
description  of the  information  set  forth  in  the  Statement  of  Additional
Information.  A copy of the Statement of Additional  Information may be obtained
without charge by contacting the Shareholder Servicing Agent (see back cover for
address and phone number).
   INVESTORS SHOULD READ THIS PROSPECTUS AND RETAIN IT FOR FUTURE REFERENCE.

<PAGE>
1.  THE FUND
MFS(R)  Municipal  High  Income Fund is a  non-diversified  series of MFS Series
Trust III, an open-end  management  investment  company which was organized as a
business trust under the laws of The  Commonwealth of Massachusetts in 1977. The
Trust  presently  consists of two series,  each of which  represents a portfolio
with separate investment policies. Two classes of shares of the Fund are offered
to the  general  public.  Class A shares are  offered at net asset value plus an
initial  sales charge (or a contingent  deferred  sales charge (a "CDSC") in the
case of certain purchases of $1 million or more).  Class B shares (which will be
available  for sale  effective  June 3,  1994) are  offered  at net asset  value
without a sales charge but subject to a CDSC and a  Distribution  Plan providing
for an annual  distribution  fee and service fee. Class B shares will convert to
Class A shares approximately eight years after purchase.

In June 1985, the Trust's Board of Trustees  decided to terminate  sales of Fund
shares,  other than to the Fund's  shareholders,  because the Fund had  attained
optimal size for management purposes. The Board of Trustees voted to re-open the
Fund for sales to new  shareholders  for the  period  from  March 1, 1989 to the
close of  business on March 23,  1989.  During such period the Fund's net assets
were  increased by  approximately  $109  million as a result of such  additional
investments.  The Board of Trustees voted again to re-open the Fund for sales to
new  shareholders for the period from February 6, 1990, to the close of business
on February 7, 1990. During such period, the Fund's net assets were increased by
approximately  $205  million  as a result  of such  additional  investments.  On
February 28, 1990, the sale of Fund shares to existing  shareholders (other than
through  the  reinvestment  of  dividends  and  capital  gains of the  Fund) was
terminated.  On November 5, 1990,  Fund shares were made  available for sales to
existing  shareholders only. In May 1994, the Trust's Board of Trustees voted to
re-open the Fund for sales to new  shareholders for the period from June 3, 1994
until the  earlier of the  following:  (i) June 10,  1994;  or (ii) the close of
business  on the day on which  aggregate  subscription  orders for shares of the
Fund  received  since  June 3,  1994  approximate  $200  million.  The Fund buys
securities  (primarily  municipal  bonds and notes  that may be in the medium or
lower rating categories or may be unrated,  the interest on which is exempt from
federal income tax) for its portfolio.

The Trust's Board of Trustees provides broad supervision over the affairs of the
Fund. Massachusetts Financial Services Company, a Delaware corporation ("MFS" or
the "Adviser"), is the Fund's investment adviser. A majority of the Trustees are
not affiliated  with the Adviser.  The Adviser is responsible for the management
of the assets of the Fund and the officers of the Trust are  responsible for the
Fund's  operations.  The Adviser manages the Fund's portfolio from day to day in
accordance with the investment objective and policies of the Fund. The selection
of investments  and the way they are managed depend on the conditions and trends
in the economy and the financial marketplaces. The Trust also offers to buy back
(redeem)  shares  of the Fund from  shareholders  at any time at their net asset
value, less any applicable CDSC.
<PAGE>
2.  EXPENSE SUMMARY
SHAREHOLDER TRANSACTION EXPENSES:                         CLASS A       CLASS B
                                                          -------       -------
  Maximum Initial Sales Charge Imposed on Purchases of
    Fund Shares (as a percentage of offering price) ....  4.75%         0.00%
  Maximum Contingent Deferred Sales Charge
    (as a percentage of original purchase or
    redemption proceeds, as applicable) ................  See Below(1)  4.00%
ANNUAL OPERATING EXPENSES (AS A PERCENTAGE OF AVERAGE
  NET ASSETS):(2)
  Management Fees ......................................  0.70%         0.70%
  Rule 12b-1 Fees ......................................  0.00%         1.00%(3)
  Other Expenses .......................................  0.40%         0.47%(4)
                                                          ----          ----
  Total Operating Expenses .............................  1.10%         2.17%
- ------------
(1) Purchases of $1 million or more are not subject to an initial  sales charge;
    however,  a CDSC of 1% will be  imposed  on such  purchases  in the event of
    certain  redemption  transactions  within 12 months following such purchases
    (see "Purchases").
(2) For Class A shares,  percentages  are based on expenses  incurred during the
    fiscal year ended January 31, 1994. Percentages for Class B shares are based
    on Class A fees and expenses adjusted for Class B specific expenses.
(3) The  Fund  has  adopted  a  Distribution  Plan  for its  Class B  shares  in
    accordance  with Rule 12b-1 under the  Investment  Company  Act of 1940,  as
    amended  (the "1940 Act"),  which  provides  that it will pay  distribution/
    service fees  aggregating up to (but not necessarily all of) 1.00% per annum
    of the  average  daily net assets  attributable  to the Class B shares  (see
    "Distribution  Plan").  After a  substantial  period  of time,  distribution
    expenses paid under this Plan,  together with any CDSC,  may total more than
    the  maximum  sales  charge  that  would  have been  permissible  if imposed
    entirely as an initial sales charge.
(4) Based on Class A expenses  incurred during the fiscal year ended January 31,
    1994,  except for the  shareholder  servicing  agent fee component of "Other
    Expenses".
                             EXAMPLE OF EXPENSES
                             -------------------
An  investor  would pay the  following  dollar  amounts of  expenses on a $1,000
investment in the Fund,  assuming (a) 5% annual return and (b) redemption at the
end of each of the time periods indicated (unless otherwise noted):

PERIOD                                  CLASS A                CLASS B
                                        -------                -------
                                                                         (1)
1 year ..........................       $ 58           $ 62              $ 22
3 years .........................         81             98                68
5 years .........................        105            136               116
10 years ........................        175            223(2)            223(2)
- ------------
(1) Assumes no redemption.
(2) Class B shares  convert to Class A shares  approximately  eight  years after
    purchase; therefore, years nine and ten reflect Class A expenses.

    The purpose of the expense table  provided  above is to assist  investors in
understanding the various costs and expenses that a shareholder of the Fund will
bear  directly  or  indirectly.  More  complete  descriptions  of the  following
expenses of the Fund are set forth in the following  sections of the Prospectus:
(i) varying sales charges on share purchases -- "Purchases";  (ii) varying CDSCs
- -- "Purchases";  (iii)  management fees -- "Investment  Adviser";  and (iv) Rule
12b-1 (i.e., distribution plan) fees -- "Distribution Plan."

    THE "EXAMPLE" SET FORTH ABOVE SHOULD NOT BE CONSIDERED A  REPRESENTATION  OF
PAST OR FUTURE EXPENSES OF THE FUND; ACTUAL EXPENSES MAY BE GREATER OR LESS THAN
THOSE SHOWN.

3.  CONDENSED FINANCIAL INFORMATION
The  following  information  should be read in  conjunction  with the  financial
statements  included  in the  Fund's  Annual  Report  to  shareholders  which is
incorporated  by reference  into the  Statement  of  Additional  Information  in
reliance  upon the  report of  Coopers & Lybrand,  independent  accountants,  as
experts in accounting and auditing. For the fiscal years after January 31, 1994,
Ernst & Young  will audit the Fund's  financial  statements  and report on those
future fiscal years.
<TABLE>
                             FINANCIAL HIGHLIGHTS
                          CLASS A AND CLASS B SHARES
<CAPTION>

                                                                  YEAR ENDED JANUARY 31,
- --------------------------------------------------------------------------------------------------------------------------------
                            1994       1993     1992     1991     1990     1989    1988      1987     1986     1985<F2>  1994
                            ------     ----     ------   ------   ------   ------  ------    ------   ------   ------    -------
<S>                         <C>        <C>      <C>      <C>      <C>      <C>     <C>       <C>      <C>      <C>       <C>
                            CLASS A                                                                                      CLASS B<F3>
PER SHARE DATA              ------                                                                                       -------
  (FOR A SHARE OUTSTANDING
  THROUGHOUT EACH PERIOD):
Net asset value -
 beginning of period .....  $ 9.26     $ 9.22   $ 9.09   $ 9.45   $ 9.55   $ 9.68  $10.38    $10.49   $ 9.80  $ 9.525    $ 9.40
 Income from investment operations -
  Net investment
   income ................  $ 0.77     $ 0.73   $ 0.73   $ 0.74   $ 0.85   $ 0.88  $ 0.84    $ 0.99   $ 0.95  $ 0.839    $ 0.32
  Net realized and
   unrealized gain (loss)
   on investments ........    0.05       0.06     0.17    (0.32)   (0.09)   (0.12)   (0.67)   (0.01)    0.71    0.191     (0.14)
                            ------     ------   ------   ------   ------   ------  -------   ------   ------  -------    ------
   Total from investment
    operations ...........  $ 0.82     $ 0.79   $ 0.90   $ 0.42   $ 0.76   $ 0.76  $  0.17   $ 0.98   $ 1.66  $ 1.030    $ 0.18
                            ------     ------   ------   ------   ------   ------  -------   ------   ------  -------    ------
Less distributions declared to shareholders -
 From net investment
  income .................  $(0.70)    $(0.75)  $(0.77)  $(0.78)  $(0.81)  $(0.82) $(0.84)   $(1.01)  $(0.94) $(0.755)   $(0.20)
 From net realized gain on
  investments ............    --          --       --      --      (0.04)   (0.07)  (0.03)    (0.08)   (0.03)   --         --
 From paid-in capital ....    --          --       --      --      (0.01)    --      --        --       --      --         --
                            ------     ------   ------   ------   ------   ------  -------   ------   ------  -------    ------
   Total distributions
    declared to
    shareholders .........  $(0.70)    $(0.75)  $(0.77)  $(0.78)  $(0.86)  $(0.89) $(0.87)   $(1.09)  $(0.97) $(0.755)   $(0.20)
                            ------     ------   ------   ------   ------   ------  -------   ------   ------  -------    ------
Net asset value - end of
 period ..................  $ 9.38     $ 9.26   $ 9.22   $ 9.09   $ 9.45   $ 9.55  $ 9.68    $10.38   $10.49  $  9.80    $ 9.38
                            ======     ======   ======   ======   ======   ======  ======    ======   ======  =======    ======
TOTAL RETURN<F4> .........   9.19%<F1>  9.02%   10.34%    4.65%    8.24%    8.32%    1.87%   10.00%   18.24%   12.36%     1.89%
RATIOS (TO AVERAGE NET ASSETS)/SUPPLEMENTAL DATA:
 Expenses ................   1.10%      1.00%    1.03%    1.05%    1.02%    0.65%    1.03%    1.00%    1.04%    1.12%<F1> 2.04%<F1>
 Net investment income ...   7.15%      7.95%    7.96%    8.17%    8.90%    9.27%    8.54%    9.54%    9.68%   10.35%<F1> 5.43%<F1>
PORTFOLIO TURNOVER .......     18%        10%      21%      41%      21%      23%      16%       9%      43%     159%       18%
NET ASSETS AT END OF
 PERIOD (000 OMITTED) ....$809,957   $731,968 $648,043 $638,185 $485,037 $325,044 $349,655 $442,036 $294,056 $112,478        $1
<FN>
- ---------
<F1> Annualized.
<F2> For  the  period  from  February  24,  1984   (commencement  of  investment
     operations) to January 31, 1985.
<F3> For the period from the initial  issuance of Class B shares,  September 27,
     1993, to January 31, 1994.
<F4> These  results  do not  include  the sales  charge.  If the charge had been
     included, the results would have been lower.
</TABLE>

4.  INVESTMENT OBJECTIVE AND POLICIES
INVESTMENT  OBJECTIVE -- The investment objective of the Fund is to provide high
current  income exempt from federal income taxes.  Any investment  involves risk
and  there  can be no  assurance  that  the Fund  will  achieve  its  investment
objective.

INVESTMENT  POLICIES -- The Fund seeks to achieve its  investment  objective  by
investing   primarily   (i.e.,   at  least  80%  of  its  assets   under  normal
circumstances) in debt securities issued by or on behalf of states,  territories
and  possessions  of the United  States,  the  District  of  Columbia  and their
political subdivisions, agencies or instrumentalities,  the interest on which is
exempt from federal income tax ("Municipal  Bonds" or "tax-exempt  securities").
Under  normal  circumstances,  the Fund  will  invest  at least 65% of its total
assets in tax-exempt securities which offer a current yield above that generally
available on tax-exempt securities in the three highest rating categories of the
recognized  rating  agencies  (commonly known as "junk bonds" if rated below the
four  highest  categories  of  recognized  rating  agencies).   Such  high  risk
securities  generally  involve  greater  volatility of price and greater risk of
nonpayment of principal and interest (including the possibility of default by or
bankruptcy of the issuers of such  securities)  than securities in higher rating
categories.  See "Risk  Factors"  below for a further  description  of the risks
associated  with  these  medium  and  lower  rated  securities.  However,  since
available  yields and yield  differentials  vary over time, no specific level of
income or yield  differential  can ever be assured.  Also,  any income earned on
portfolio  securities  would be reduced by the expenses of the Fund before it is
distributed to shareholders.

The Fund may purchase  Municipal  Bonds, the interest on which may be subject to
an  alternative  minimum tax (for the purpose of this  Prospectus,  the interest
thereon is nonetheless considered to be tax-exempt).  For a comparison of yields
on Municipal Bonds and taxable  securities,  see Appendix A to this  Prospectus;
for a general  discussion  of  Municipal  Bonds  and a  description  of  Moody's
Investors Service, Inc. ("Moody's"), Standard & Poor's Ratings Group ("S&P") and
Fitch Investors Service, Inc. ("Fitch") ratings of Municipal Bonds, see Appendix
B to this  Prospectus;  and for a chart indicating the composition of the Fund's
portfolio for its most recent fiscal year with the debt securities  rated by S&P
separated into rating categories, see Appendix C to this Prospectus.

The value of the tax-exempt  securities that the Fund intends to purchase may be
less sensitive to market  factors than other  securities;  however,  they may be
more  sensitive  to changes  in the  perception  of the  credit  quality of such
securities, or of similar types of securities or of securities issued within the
same geographical region. Changes in the value of securities subsequent to their
acquisition will not affect income or yields to maturity of the Fund's portfolio
securities  but will be  reflected  in the net asset  value of the shares of the
Fund.  In order to preserve or enhance  the value of its  investments,  the Fund
may, on occasion,  make additional capital  expenditures beyond the initial cost
of an  investment.  The Fund will seek to reduce risk  through  diversification,
credit  analysis and  attention to current  developments  and trends in both the
economy and financial markets.  The net asset value of the shares of an open-end
investment  company,  such as the Fund, which invests  primarily in fixed income
tax-exempt  securities,   changes  as  the  general  levels  of  interest  rates
fluctuate.  When interest  rates decline,  the value of a portfolio  invested at
higher yields can be expected to rise. Conversely, when interest rates rise, the
value of a portfolio invested at lower yields can be expected to decline.

When the Adviser believes that investing for defensive  purposes is appropriate,
such as during  periods  of  unusual  market  conditions  or at times when yield
spreads are narrow and the higher yields do not justify the increased risk or if
acceptable  quantities of higher yielding  securities are unavailable,  the Fund
may either  invest in tax-exempt  securities in the higher rating  categories of
recognized  rating agencies (that is, ratings of A or higher by Moody's,  S&P or
Fitch or comparable unrated tax-exempt securities) or in cash or cash equivalent
short-term obligations of similar quality (i.e., with ratings equivalent to A or
better by Moody's,  S&P or Fitch or comparable  unrated  tax-exempt  securities)
including, but not limited to, short-term municipal obligations, certificates of
deposit, commercial paper, short-term notes, obligations issued or guaranteed by
the U.S. Government or any of its agencies or  instrumentalities  and repurchase
agreements.  From time to time,  a portion of the Fund's  distributions  will be
taxable to shareholders (e.g., distributions of income from taxable obligations,
from capital gains,  from  transactions in certain  Municipal Bonds purchased at
market discount and from certain other transactions).

The Fund may invest in a relatively high percentage of municipal bonds issued by
entities having similar characteristics.  The issuers may be located in the same
geographic  area,  or may pay  interest  on their  obligations  from  revenue of
similar  projects  such as hospitals,  electric  utility  systems,  multi-family
housing,   nursing  homes,   commercial  facilities  (including  hotels),  steel
companies or life care  facilities.  This may make the Fund more  susceptible to
similar economic,  political,  or regulatory  occurrences.  As the similarity in
issuers  increases,  the  potential  for  fluctuation  of the net asset value of
shares of the Fund also increases.

The Fund  reserves the right to invest more than 25% of its assets in industrial
revenue bonds, including industrial revenue bonds issued for hospitals, electric
utility systems,  multi-family  housing,  nursing homes,  commercial  facilities
(including hotels), steel companies and life care facilities.  See the Statement
of Additional  Information for a discussion of the risks which these investments
might entail.  Certain of the bonds issued for these purposes provide  financing
for  construction or  rehabilitation  of facilities as described  above. As such
they are  susceptible to various  construction  related risks,  including  labor
costs and environmental,  zoning and site development considerations, as well as
the ability of contractors to perform within time and cost constraints.

From  time to time,  proposals  have been  introduced  before  Congress  for the
purpose of  restricting  or  eliminating  the federal  income tax  exemption for
interest on Municipal  Bonds.  See "Tax Status"  below for the effect of current
federal tax law on this exemption.

ZERO COUPON  BONDS:  Municipal  Bonds in which the Fund may invest also  include
zero coupon bonds.  Zero coupon bonds are debt obligations which are issued at a
significant  discount from face value and do not require the periodic payment of
interest.  The discount approximates the total amount of interest the bonds will
accrue and compound over the period until maturity or the first interest payment
date at a rate of interest  reflecting  the market  rate of the  security at the
time of issuance.  Zero coupon bonds benefit the issuer by  mitigating  its need
for cash to meet  debt  service,  but also  require  a higher  rate of return to
attract  investors  who  are  willing  to  defer  receipt  of  such  cash.  Such
investments may experience  greater volatility in market value due to changes in
interest rates than debt  obligations  which make regular  payments of interest.
The Fund will accrue income on such investments for tax and accounting purposes,
as required,  which is distributable to shareholders and which,  because no cash
is  received  at the time of  accrual,  may  require  the  liquidation  of other
portfolio securities to satisfy the Fund's distribution obligations.  Because of
the  higher  rates of  return,  such  investments  are  regarded  by the Fund as
consistent with its investment objective.

INVERSE  FLOATING RATE  OBLIGATIONS:  The Fund may invest in so called  "inverse
floating rate obligations" or "residual interest" bonds, or other obligations or
certificates  relating  thereto  structured  to  have  similar  features.   Such
obligations  generally have floating or variable interest rates that move in the
opposite  direction  of  short-term  interest  rates and  generally  increase or
decrease in value in response to changes in short-term  interest rates at a rate
which is a multiple  (typically two) of the rate at which  fixed-rate  long-term
tax-exempt  securities  increase or decrease in response to such  changes.  As a
result,  such obligations have the effect of providing  investment  leverage and
may be more volatile than long-term fixed rate tax exempt obligations.

Repurchase Agreements: The Fund may enter into repurchase agreements in order to
earn additional  income on available cash or as a temporary  defensive  measure.
Under a  repurchase  agreement,  the Fund  acquires  securities  subject  to the
seller's  agreement to repurchase at a specified  time and price.  If the seller
becomes  subject to a  proceeding  under the  bankruptcy  laws or its assets are
otherwise  subject to a stay order, the Fund's right to liquidate the securities
may be restricted (during which time the value of the securities could decline).
As discussed in the  Statement of Additional  Information,  the Fund has adopted
certain procedures intended to minimize any risk.

LOANS AND OTHER DIRECT INDEBTEDNESS: The Fund may invest a portion of its assets
in "loans." By purchasing a loan,  the Fund acquires some or all of the interest
of a bank or other lending institution in a loan to a corporate  borrower.  Many
such loans are secured, and most impose restrictive  covenants which must be met
by the  borrower.  These loans are made  generally to finance  internal  growth,
mergers, acquisitions, stock repurchases, leveraged buy-outs and other corporate
activities.  Such loans may be in default at the time of purchase.  The Fund may
also purchase trade or other claims against companies, which generally represent
money owed by the company to a supplier of goods and services.  These claims may
also be purchased at a time when the company is in default. Certain of the loans
acquired by the Fund may involve  revolving  credit  facilities or other standby
financing  commitments  which  obligate  the  Fund to pay  additional  cash on a
certain date or on demand.

The highly  leveraged  nature of many such loans may make such loans  especially
vulnerable to adverse changes in economic or market conditions.  Loans and other
direct  investments  may not be in the form of  securities  or may be subject to
restrictions  on transfer,  and only limited  opportunities  may exist to resell
such instruments.  As a result,  the Fund may be unable to sell such investments
at an opportune  time or may have to resell them at less than fair market value.
For a further discussion of loans and the risks related to transactions therein,
see the Statement of Additional Information.

"WHEN-ISSUED"  SECURITIES:  Some  tax-exempt  securities  may be  purchased on a
"when-issued" or on a "forward delivery" basis, which means that the obligations
will be  delivered  to the  Fund at a  future  date,  usually  beyond  customary
settlement time. The commitment to purchase a security for which payment will be
made on a future date may be deemed a separate  security.  Although  the Fund is
not  limited as to the  amount of  tax-exempt  securities  for which it has such
commitments,  it is expected that under normal circumstances,  the Fund will not
commit more than 30% of its assets to such purchases.  The Fund does not pay for
the  securities  until  received,  and does not start  earning  interest  on the
securities until the contractual  settlement date. In order to invest its assets
immediately while awaiting  delivery of securities  purchased on such bases, the
Fund  will  normally  invest  in  short-term   securities  that  offer  same-day
settlement  and  earnings,  but that  may bear  interest  at a lower  rate  than
longer-term  securities;  however,  the Fund  also  may  invest  in  longer-term
securities.  It is the intention of the Fund that these investments will usually
be in  securities  the interest on which is exempt from federal  income tax. For
additional  information concerning the use, risks and costs of "when-issued" and
"forward delivery" securities, see the Statement of Additional Information.

OPTIONS:  The Fund  intends to write  (sell)  "covered"  put and call options on
fixed income  securities.  Call options  written by the Fund give the holder the
right to buy the underlying  securities  from the Fund at a fixed exercise price
up to a stated expiration date or, in the case of certain options, on such date.
Put options written by the Fund give the holder the right to sell the underlying
securities to the Fund during the term of the option at a fixed  exercise  price
up to a stated expiration date or, in the case of certain options, on such date.
Call options are "covered" by the Fund, for example, when it owns the underlying
securities,  and put options are "covered" by the Fund, for example, when it has
established a segregated  account of cash or short-term money market instruments
which can be  liquidated  promptly  to  satisfy  any  obligation  of the Fund to
purchase  the  underlying   securities.   The  Fund  may  also  write  straddles
(combinations  of  puts  and  calls  on  the  same  underlying  security).  Such
transactions generate additional premium income but also include greater risk.

The Fund will  receive  a  premium  from  writing  a put or call  option,  which
increases the Fund's gross income in the event the option expires unexercised or
is closed out at a profit.  The amount of the premium will reflect,  among other
things,  the  relationship  of the  exercise  price  to  the  market  price  and
volatility of the underlying security,  the remaining term of the option, supply
and demand and interest  rates.  By writing a call  option,  the Fund limits its
opportunity  to profit from any increase in the market  value of the  underlying
security  above the exercise price of the option.  By writing a put option,  the
Fund  assumes  the risk  that it may be  required  to  purchase  the  underlying
security  for an exercise  price  higher  than its  then-current  market  value,
resulting  in  a  potential  capital  loss  unless  the  security   subsequently
appreciates in value.

The Fund may terminate an option that it has written prior to its  expiration by
entering  into a closing  purchase  transaction  in which it purchases an option
having the same terms as the  option  written.  It is  possible,  however,  that
illiquidity  in the options  markets may make it difficult from time to time for
the Fund to close out its written option  positions.  The Fund may also purchase
put or call  options in  anticipation  of changes in  interest  rates  which may
adversely affect the value of its portfolio or the prices of securities that the
Fund wants to  purchase  at a later  date.  The  premium  paid for a put or call
option plus any transaction  costs will reduce the benefit,  if any, realized by
the Fund upon exercise of the option,  and,  unless the price of the  underlying
security changes sufficiently, the option may expire without value to the Fund.

The Fund  intends  to write and  purchase  options  on  securities  for  hedging
purposes and also in an effort to increase current income. Options on securities
that are written or purchased by the Fund will be traded on U.S.  exchanges  and
over-the-counter.

The Fund may purchase detachable call options on municipal securities, which are
options issued by an issuer of the underlying  municipal  securities  giving the
purchaser  the right to purchase the  securities  at a fixed  price,  up to at a
stated time in the future, or in some cases, on a future date. In addition,  the
Fund may  purchase  warrants on fixed  income  securities.  A warrant on a fixed
income  security  is a  long-dated  call option  conveying  to the holder of the
warrant the right,  but not the obligation,  to purchase a fixed income security
of a specific  description  (from the  issuer)  on a certain  date or dates (the
exercise date) at a fixed exercise price.

FUTURES  CONTRACTS AND OPTIONS ON FUTURES  CONTRACTS:  The Fund may purchase and
sell futures contracts on fixed income securities or indices of such securities,
including  Municipal  Bond  indices  and  any  other  indices  of  fixed  income
securities which may become  available for trading  ("Futures  Contracts").  The
Fund may also purchase and write options on such Futures Contracts  ("Options on
Futures Contracts"). These instruments will be used to hedge against anticipated
future changes in interest rates which otherwise might either  adversely  affect
the value of the Fund's  portfolio  securities or adversely affect the prices of
securities  which the Fund intends to purchase at a later date.  Should interest
rates move in an  unexpected  manner,  the Fund may not achieve the  anticipated
benefits of the hedging  transactions and may realize a loss. Such  transactions
may also be entered  into for  non-hedging  purposes to the extent  permitted by
applicable  law, which involves  greater risk and may result in losses which are
not offset by gains on other portfolio assets.

In order to assure that the Fund will not be deemed to be a "commodity pool" for
purposes of the Commodity  Exchange Act,  regulations  of the Commodity  Futures
Trading Commission (the "CFTC") require that the Fund enter into transactions in
Futures  Contracts  and  Options  on  Futures  Contracts  only (i) for bona fide
hedging  purposes  (as  defined in CFTC  regulations),  or (ii) for  non-hedging
purposes,  provided  that the  aggregate  initial  margin and  premiums  on such
non-hedging  positions does not exceed 5% of the liquidation value of the Fund's
assets. In addition, the Fund must comply with the requirements of various state
securities laws in connection with such transactions.

The Fund has adopted the  additional  restriction  that it will not enter into a
Futures Contract if, immediately  thereafter,  the value of securities and other
obligations  underlying all such Futures Contracts would exceed 50% of the value
of the Fund's total  assets.  Moreover,  the Fund will not purchase put and call
options on securities or on Futures Contracts,  if as a result,  more than 5% of
its total assets would be invested in such options.

Futures  Contracts and Options on Futures Contracts that are entered into by the
Fund will be traded on U.S. exchanges.

RISK FACTORS: Although the Fund will enter into certain transactions in options,
Futures Contracts and Options on Futures  Contracts for hedging  purposes,  such
transactions  nevertheless  involve  risks.  For example,  a lack of correlation
between the instrument  underlying an option or Futures  Contract and the assets
being hedged,  or unexpected  adverse price  movements,  could render the Fund's
hedging  strategy  unsuccessful  and could  result in losses.  The Fund also may
enter into  transactions  in options,  Futures  Contracts and Options on Futures
Contracts for other than hedging purposes, to the extent permitted by applicable
law, which involves greater risk. In addition,  there can be no assurance that a
liquid secondary  market will exist for any contract  purchased or sold, and the
Fund may be required to maintain a position until exercise or expiration,  which
could result in losses.  The  Statement  of  Additional  Information  contains a
further  description  of  options,  Futures  Contracts  and  Options  on Futures
Contracts,  and a  discussion  of the risks  related  to  transactions  therein.
Transactions  entered into for  non-hedging  purposes  involve  greater risk and
could result in losses which are not offset by gains on other portfolio assets.

Transactions in options may be entered into on U.S.  exchanges  regulated by the
SEC and in the  over-the-counter  market, while Futures Contracts and Options on
Futures Contracts may be entered into on U.S. commodities exchanges regulated by
the CFTC.  Over-the-counter  transactions involve certain risks which may not be
present in exchange-traded transactions.

Gains  recognized from options and futures  transactions  engaged in by the Fund
are taxable to  shareholders  upon  distribution.  

PORTFOLIO  TRADING:  The Fund intends to engage in portfolio trading rather than
holding all portfolio securities to maturity.  In trading portfolio  securities,
the Fund seeks to take advantage of market  developments,  yield disparities and
variations in the creditworthiness of issuers.

The  primary  consideration  in placing  portfolio  security  transactions  with
broker-dealers  for execution is to obtain,  and maintain the  availability  of,
execution  at  the  most  favorable  prices  and in the  most  effective  manner
possible. Consistent with the foregoing primary consideration, the Rules of Fair
Practice of the National  Association of Securities Dealers,  Inc., (the "NASD")
and such other policies as the Trustees may determine,  the Adviser may consider
sales of shares of the Fund and of the other  investment  company clients of MFS
Financial Services,  Inc. ("FSI"),  the Fund's  distributor,  as a factor in the
selection of broker-dealers  to execute the portfolio  transactions of the Fund.
For a further  discussion of portfolio trading,  see "Portfolio  Trading" in the
Fund's Statement of Additional Information.

                          ---------------------------

The investment objective and policies of the Fund described above may be changed
without shareholder approval. The Statement of Additional Information includes a
discussion  of other  investment  policies and a listing of specific  investment
restrictions  which  govern  the  investment  policies  of the  Fund.  Except as
otherwise indicated,  the Fund's specific investment  restrictions listed in the
Statement of Additional  Information  may not be changed without the approval of
the shareholders of the Fund.

The Fund's  investment  limitations  and  policies are adhered to at the time of
purchase or utilization of assets; a subsequent change in circumstances will not
be considered to result in a violation of policy.

5.  RISK FACTORS
Tax-exempt  securities  offering the high current  income sought by the Fund are
ordinarily  in the medium  and lower  rating  categories  of  recognized  rating
agencies or are  unrated  and,  therefore,  generally  are high risk  securities
involving  greater  volatility of price  (especially  during periods of economic
uncertainty  or change) and risk of  principal  (including  the  possibility  of
default by or  bankruptcy  of the  issuers of such  securities)  and income than
securities in the higher rating categories and because yields vary over time, no
specific  level of income can ever be assured.  No minimum rating is required by
the Fund. In particular,  securities rated BBB by S&P or Fitch or Baa by Moody's
or comparable unrated securities,  while normally exhibiting adequate protection
parameters,  have speculative characteristics and changes in economic conditions
and other  circumstances  are more likely to lead to a weakened capacity to make
principal  and  interest  payments  than in the case of higher  grade  Municipal
Bonds.  Securities  rated  lower  than BBB by S&P or Fitch or Baa by  Moody's or
comparable unrated securities (high risk securities) are considered speculative.
While  such  high  risk   securities   may  have  some  quality  and  protective
characteristics, they can be expected to be outweighed by large uncertainties or
major  risk  exposures  to adverse  conditions.  These  Municipal  Bonds will be
affected by the market's  perception of their credit quality,  economic  changes
and the  outlook for  economic  growth to a greater  extent  than  higher  rated
securities  which  react  primarily  to  fluctuations  in the  general  level of
interest  rates.  Medium and lower rated  Municipal  Bonds are also  affected by
changes in interest  rates,  as noted in  "Investment  Objective  and  Policies"
above.  Furthermore,  an economic  downturn may result in a higher  incidence of
defaults by issuers of these  securities.  During  certain  periods,  the higher
yields on the Fund's lower rated high yielding fixed income  securities are paid
primarily because of the increased risk of loss of principal and income, arising
from such factors as the heightened  possibility of default or bankruptcy of the
issuers  of  such  securities.  Due  to  the  fixed  income  payments  of  these
securities,  the Fund may  continue  to earn the same level of  interest  income
while its net asset value declines due to portfolio  losses,  which could result
in an increase in the Fund's yield despite the actual loss of principal.

In addition,  these medium and lower rated or unrated tax-exempt  securities are
frequently  traded only in markets where the number of potential  purchasers and
sellers, if any, is very limited. Furthermore, the liquidity of these securities
may be affected by the  market's  perception  of the  issuer's  credit  quality.
Therefore, judgment may at times play a greater role in valuing these securities
than in the case of higher grade tax-exempt  securities.  This consideration may
also have the effect of limiting the  availability  of such  securities  for the
Fund to  purchase  and may also have the effect of  limiting  the ability of the
Fund to sell such  securities  at their  fair  value  either to meet  redemption
requests or to respond to changes in the economy or the financial markets.

While the  Adviser  may refer to ratings  issued by  established  credit  rating
agencies, it is not the policy of the Fund to rely exclusively on ratings issued
by these agencies,  but rather to supplement such ratings with the Adviser's own
independent and ongoing review of credit quality.  The Fund's achievement of its
investment  objective may be more dependent on the Adviser's own credit analysis
than in the case of an investment  company investing in primarily higher quality
bonds.  With respect to those municipal bonds and notes which are not rated by a
major rating  agency,  the Fund will be more reliant on the Adviser's  judgment,
analysis  and  experience  than  would be the case if such  bonds and notes were
rated.  In  evaluating  the  creditworthiness  of an  issuer,  whether  rated or
unrated,  the Adviser  will take into  consideration,  among other  things,  the
issuer's financial resources, its sensitivity to economic conditions and trends,
any operating  history of and the community support for the facility financed by
the issue, the ability of the issuer's management and regulatory matters.

The Adviser  will  attempt to reduce the risks of  investing  in medium or lower
rated or  unrated  tax-exempt  securities  to the  greatest  extent  practicable
through  portfolio  management  techniques  (see  the  Statement  of  Additional
Information) and through the use of credit analysis and Futures  Contracts.  

The Fund has  registered as a  "non-diversified"  investment  company so that it
will be able to invest  more  than 5% of its  assets  in the  obligations  of an
issuer,  subject to the  diversification  requirements  of  Subchapter  M of the
Internal  Revenue  Code of  1986,  as  amended.  Since  the  Fund  may  invest a
relatively  high percentage of its assets in the obligations of a limited number
of issuers,  the Fund may be more susceptible to any single economic,  political
or regulatory occurrence than a diversified investment company.

For the above reasons, an investment in shares of the Fund should not constitute
a complete  investment  program and may not be  appropriate  for  investors  who
cannot  assume the  greater  risk of capital  depreciation  or loss  inherent in
seeking higher tax-exempt yields.

6.  MANAGEMENT OF THE FUND
INVESTMENT  ADVISER  -- MFS  manages  the  assets  of the  Fund  pursuant  to an
Investment  Advisory  Agreement  dated  September 1, 1993. MFS provides the Fund
with overall investment advisory and administrative services, as well as general
office facilities. Cynthia M. Brown, a Senior Vice President of the Adviser, has
been the  Fund's  portfolio  manager  since  1993 and has been  employed  by the
Adviser since 1984. Subject to such policies as the Trustees may determine,  MFS
makes investment decisions for the Fund. For these services and facilities,  MFS
receives a management fee, computed and paid monthly,  in an amount equal to the
sum of 0.30% of the Fund's  average  daily net  assets  plus 4.75% of the Fund's
gross income (i.e., income other than from the sale of securities), in each case
on an annualized basis, for the Fund's then-current fiscal year.

For the fiscal  year ended  January  31,  1994,  MFS earned  management  fees of
$5,400,831  (of which  $2,335,614  was based on  average  daily net  assets  and
$3,065,217 on gross income),  equivalent on an annualized  basis to 0.70% of the
Fund's average daily net assets.

MFS also  serves as  investment  adviser  to each of the other  funds in the MFS
Family  of  Funds  (the  "MFS  Funds"),  to  MFS  Municipal  Income  Trust,  MFS
Multimarket  Income Trust, MFS Government Markets Income Trust, MFS Intermediate
Income  Trust,   MFS  Charter  Income  Trust,   MFS  Special  Value  Trust,  MFS
Institutional Trust, MFS Union Standard Trust, Sun Growth Variable Annuity Fund,
Inc., MFS/Sun Life Series Trust and seven variable accounts,  each of which is a
registered  investment  company  established  by Sun Life  Assurance  Company of
Canada  (U.S.)  ("Sun Life of Canada  (U.S.)")  in  connection  with the sale of
Compass-2 and Compass-3 combination  fixed/variable  annuity contracts.  The MFS
Asset Management Group, a division of the Adviser, provides investment advice to
substantial private clients.

MFS is  America's  oldest  mutual  fund  organization.  MFS and its  predecessor
organizations  have a  history  of money  management  dating  from  1924 and the
founding of the first mutual fund in the United States,  Massachusetts Investors
Trust.   Net  assets  under  the  management  of  the  MFS   organization   were
approximately  $33.6  billion on behalf of  approximately  1.4 million  investor
accounts as of April 30, 1994.  As of such date,  the MFS  organization  managed
approximately   $6.7  billion  of  assets  in  municipal  bond   securities  and
approximately  $19.6  billion  of assets in fixed  income  securities.  MFS is a
subsidiary  of Sun Life of Canada  (U.S.),  which in turn is a subsidiary of Sun
Life Assurance Company of Canada ("Sun Life"). The Directors of MFS are A. Keith
Brodkin, Jeffrey L. Shames, John R. Gardner, John D. McNeil and Arnold D. Scott.
Mr.  Brodkin is the  Chairman,  Mr.  Shames is the  President and Mr. Scott is a
Senior  Executive  Vice President and the Secretary of MFS.  Messrs.  McNeil and
Gardner are the Chairman and the President, respectively, of Sun Life. Sun Life,
a mutual  life  insurance  company,  is one of the  largest  international  life
insurance  companies  and has been  operating  in the United  States since 1895,
establishing a headquarters  office here in 1973. The executive  officers of MFS
report to the Chairman of Sun Life.

A. Keith  Brodkin,  the  Chairman  and a Director  of MFS, is the  Chairman  and
President  of the  Trust.  Joan S.  Batchelder,  Cynthia  M.  Brown,  Matthew N.
Fontaine,  Robert J. Manning,  Bernard  Scozzafava,  James T. Swanson, W. Thomas
London,  James O. Yost, Stephen E. Cavan,  James R. Bordewick,  Jr. and Linda J.
Hoard, all of whom are officers of MFS, are officers of the Trust.

DISTRIBUTOR -- MFS Financial  Services,  Inc. ("FSI"), a wholly owned subsidiary
of MFS, is the  distributor of shares of the Fund and also serves as distributor
for each of the other MFS Funds.

SHAREHOLDER SERVICING AGENT -- MFS Service Center, Inc. ("Shareholder  Servicing
Agent"),  a wholly owned subsidiary of MFS,  performs  transfer agency,  certain
dividend disbursing agency and other services for the Fund.

7.  INFORMATION CONCERNING SHARES OF THE FUND
PURCHASES
As noted above under "The Fund," the Fund will be  re-opened on June 3, 1994 for
a limited  period  for  sales to new  investors.  Following  this  period,  only
existing  shareholders  of the Fund may  purchase  Class A and  Class B  shares.
Because of this restriction, certain dealers in the past have transferred and in
the  future  may  transfer  a share of the  Fund to  certain  of  their  clients
interested in becoming  shareholders  of the Fund so that such clients will then
be able to buy additional shares of the Fund.  Subject to the above restriction,
shares of the Fund may be purchased  at the public  offering  price  through any
securities dealer, certain banks and other financial institutions having selling
agreements with FSI, the Fund's  principal  underwriter.  Non-securities  dealer
financial  institutions  will  receive  transaction  fees  that  are the same as
commissions to dealers.  Securities dealers and other financial institutions may
also charge their customers service fees relating to investments in the Fund.

The Fund offers two classes of shares which bear sales charges and  distribution
fees in different forms and amounts:

CLASS A SHARES.  Class A shares are offered at net asset value per share plus an
initial sales charge (or CDSC in the case of certain  purchases of $1 million or
more) as follows:

<TABLE>
<CAPTION>
                                               SALES CHARGE<F1> AS
                                                PERCENTAGE OF:
                                     --------------------------------       DEALER ALLOWANCE 
                                                           NET AMOUNT        AS A PERCENTAGE 
AMOUNT OF PURCHASE                   OFFERING PRICE         INVESTED        OF OFFERING PRICE
<S>                                  <C>                   <C>              <C>  
Less than $100,000                        4.75%              4.99%             4.00%
$100,000 but less than $250,000           4.00               4.17              3.20
$250,000 but less than $500,000           2.95               3.04              2.25
$500,000 but less than $1,000,000         2.20               2.25              1.70
$1,000,000 or more                       None<F2>            None<F2>          See Below<F2>

<FN>
<F1>Because of rounding  in the  calculation  of  offering price,  actual  sales
    charges  may be more or less than  those  calculated  using the  percentages
    above.
<F2>A CDSC may apply in  certain  circumstances.  FSI will pay  a commission  on
    purchases of $1 million or more.
</FN>
</TABLE>

If shares of the Fund are  available for sale, no sales charge is payable at the
time of  purchase  of Class A  shares  on  investments  of $1  million  or more.
However,  a CDSC shall be imposed  on such  investments  in the event of a share
redemption  within 12 months following the share purchase,  at the rate of 1% on
the  lesser  of the  value  of the  shares  redeemed  (exclusive  of  reinvested
dividends and capital gain distributions) or the total cost of such shares.

In determining whether a CDSC on such Class A shares is payable, and, if so, the
amount of the charge,  it is assumed that shares not subject to the CDSC are the
first redeemed followed by other shares held for the longest period of time. All
investments  made during a calendar  month,  regardless of when during the month
the  investment  occurred,  will age one  month on the last day of the month and
each subsequent month. Except as noted below, the CDSC on Class A shares will be
waived in the case of: (i)  exchanges  (except  that if the shares  acquired  by
exchange were then redeemed within 12 months of the initial purchase (other than
in connection  with subsequent  exchanges to other MFS Funds),  the charge would
not be waived);  (ii)  distributions  to  participants  from a  retirement  plan
qualified under section 401(a) of the Internal  Revenue Code of 1986, as amended
(the "Code") (a "Retirement  Plan") due to: (a) a loan from the plan (repayments
of loans,  however,  will  constitute  new sales for purposes of  assessing  the
CDSC); (b) "financial  hardship" of the participant in the plan, as that term is
defined in Treasury Regulation Section 1.401(k)-1(d)(2), as amended from time to
time; or (c) the death of a participant in such plans; (iii)  distributions from
a  403(b)  plan  or an  Individual  Retirement  Account  ("IRA")  due to  death,
disability  or  attainment  of age  59-1/2;  (iv)  tax- free  returns  of excess
contributions  to an IRA; (v)  distributions  by other employee benefit plans to
pay  benefits;  and (vi) certain  involuntary  redemptions  and  redemptions  in
connection with certain automatic  withdrawals from a qualified retirement plan.
The CDSC on Class A shares will not be waived,  however,  if the Retirement Plan
withdraws from the Fund except if that  Retirement  Plan has invested its assets
in Class A shares of one or more of the MFS  Funds  for more than 10 years  from
the later to occur of (i) January 1, 1993 or (ii) the date such  Retirement Plan
first invests its assets in Class A shares of one or more of the MFS Funds,  the
CDSC on Class A shares will be waived in the case of a redemption  of all of the
Retirement  Plan's shares (including shares of any other class) in all MFS Funds
(i.e.,  all the  assets of the  Retirement  Plan  invested  in the MFS Funds are
withdrawn),  unless,  immediately prior to the redemption,  the aggregate amount
invested by the  Retirement  Plan in Class A shares of the MFS Funds  (excluding
the reinvestment of distributions)  during the prior four year period equals 50%
or more of the total value of the Retirement  Plan's assets in the MFS Funds, in
which case the CDSC will not be waived.  Any  applicable  CDSC will be  deferred
upon an exchange of Class A shares of the Fund for units of participation of the
MFS Fixed Fund (a bank collective  investment fund) (the "Units"),  and the CDSC
will be deducted from the redemption  proceeds when such Units are  subsequently
redeemed  (assuming the CDSC is then payable).  No CDSC will be assessed upon an
exchange of Units for Class A shares of the Fund.  For  purposes of  calculating
the CDSC payable upon redemption of Class A shares of the Fund or Units acquired
pursuant to one or more  exchanges,  the period  during which the Units are held
will be aggregated with the period during which the Class A shares are held. The
applicability of the CDSC will be unaffected by transfers of  registration.  FSI
shall receive all CDSCs.

FSI allows  discounts  to dealers  (which  are alike for all  dealers)  from the
applicable public offering price as shown in the above table. In the case of the
maximum sales charge, the dealer retains 4% and FSI retains approximately 3/4 of
1% of the public offering  price. In addition,  FSI pays a commission to dealers
who initiate and are responsible for purchases of $1 million or more as follows:
1.00% on sales up to $5  million,  plus  0.25% on the  amount  in  excess  of $5
million.  Purchases of $1 million or more for each  shareholder  account will be
aggregated  over a 12-month period  (commencing  from the date of the first such
purchase) for purposes of determining  the level of commission to be paid during
that period with respect to such account. The sales charge may vary depending on
the  number of shares of the Fund as well as certain  MFS Funds and other  funds
owned or being purchased,  the existence of an agreement to purchase  additional
shares  during a  13-month  period (or a 36-month  period  for  purchases  of $1
million or more) or other special purchase programs.  A description of the Right
of  Accumulation,  Letter of Intent and Group Purchases  privileges by which the
sales  charge  may be  reduced  is set  forth  in the  Statement  of  Additional
Information.

If available for sale, Class A shares of the Fund may be sold at their net asset
value to the officers of the Trust,  to any of the  subsidiary  companies of Sun
Life, to eligible Directors,  officers,  employees (including retired and former
employees) and agents of MFS, Sun Life or any of their subsidiary companies,  to
any trust,  pension,  profit-sharing or any other benefit plan for such persons,
to any trustees  and retired  trustees of any  investment  company for which FSI
serves as distributor or principal underwriter, and to certain family members of
such  individuals  and their  spouses,  provided  the shares  will not be resold
except to the Fund. Class A shares of the Fund may be sold at net asset value to
any  employee,  partner,  officer or trustee of any sub-adviser  to any MFS Fund
and to certain family members of such  individuals and their spouses,  or to any
trust, pensions, profit-sharing or other retirement plan for the sole benefit of
such employee or representative,  provided such shares will not be resold except
to the Fund.  Class A shares,  if available  for sale,  may be sold at their net
asset value to any employee or registered  representative of any dealer or other
financial institution which has a sales agreement with FSI or its affiliates, to
certain family members of such employees or  representatives  and their spouses,
or to any trust,  pension,  profit-sharing or other retirement plan for the sole
benefit of such  employee  or  representative,  as well as to clients of the MFS
Asset  Management  Group.  If available,  Class A shares of the Fund also may be
sold at net asset value, subject to appropriate documentation,  through a dealer
where the amount  invested  represents  redemption  proceeds  from a  registered
open-end management  investment company not distributed or managed by FSI or its
affiliates,  if such  redemption  has occurred no more than 60 days prior to the
purchase  of Class A shares of the Fund and the  shareholder  either (i) paid an
initial  sales  charge or (ii) was at some time subject to, but did not actually
pay, a deferred  sales charge with respect to the redemption  proceeds.  Class A
shares of the Fund may also be sold at net asset value where the amount invested
represents  redemption  proceeds  from the MFS Fixed  Fund.  Class A shares,  if
available  for  sale,  may be sold at net  asset  value in  connection  with the
acquisition  or  liquidation  of the  assets of other  investment  companies  or
personal  holding  companies.  Insurance  company  separate  accounts  may  also
purchase  Class A shares of the Fund,  if avaliable for sale, at their net asset
value.  Furthermore,  Class A shares,  if available for sale, may be sold at net
asset value through the automatic  reinvestment of distribution of dividends and
capital gains of other MFS Funds pursuant to the Distribution Investment Program
(see  "Shareholder  Services" in the  Statement of Additional  Information).  If
available  for sale,  Class A shares of the Fund may also be  purchased at their
net asset value by  retirement  plans where third party  administrators  of such
plans have entered into certain arrangements with FSI or its affiliates provided
that no  commission  is paid to  dealers.  Class A  shares  of the  Fund  may be
purchased at net asset value by retirement  plans qualified under section 401(a)
or 403(b) of the Code  which  are  subject  to the  Employee  Retirement  Income
Security Act of 1974, as amended, as follows:

  (i) the retirement plan and/or the sponsoring  organization  must subscribe to
  the MFS  Fundamental  401(k)  Plan(SM) or another  similar  Section  401(a) or
  403(b) recordkeeping program made available by MFS Service Center, Inc.;

  (ii) either (a) the sponsoring organization must have at least 25 employees or
  (b) the aggregate  purchases by the  retirement  plan of Class A shares of the
  MFS Funds must be in an amount of at least $250,000 within a reasonable period
  of time, as deterimined by FSI in its sole discretion; and

  (iii) a CDSC of 1% will be imposed on such  purchases  in the event of certain
  redemption transactions within 12 months following such purchases.

Dealers who initiate and are  responsible for purchases of Class A shares of the
Fund in this manner will be paid a commission by FSI, as follows: 1.00% on sales
up to $5 million,  plus 0.25% on the amount in excess of $5  million;  provided,
however,  that FSI may pay a  commission,  on sales in excess of $5  million  to
certain   retirement  plans,  of  1.00%  to  certain  dealers  which,  at  FSI's
invitation,  enter  into an  agreement  with FSI in which the  dealer  agrees to
return any commission paid to it on the sale (or on a pro rata portion  thereof)
if the  shareholder  redeems  his or her  shares  within a period of time  after
purchase  as  specified  by  FSI.  Purchases  of $1  million  or more  for  each
shareholder  account will be aggregated over a 12-month period  (commencing from
the date of the first such  purchase) for purposes of  determining  the level of
commissions to be paid during that period with respect to such account.

Class A shares of the Fund may be sold at net asset value  through the automatic
reinvestment  of Class A and Class B  periodic  distributions  which  constitute
required withdrawals from qualified retirement plans. Class A shares of the Fund
may also be  purchased  at net asset value where the purchase is in an amount of
$3 million or more and where the dealer and FSI enter into an agreement in which
the dealer agrees to return any  commission  paid to it on the sale (or on a pro
rata portion  thereof) as described above if the shareholder  redeems his or her
shares within a year of purchase. (Shareholders who purchase shares at net asset
value  pursuant  to these  conditions  are  called "$3  Million  Shareholders").
Furthermore,  Class A shares of the Fund may be sold at net asset value  through
the automatic  reinvestment of  distirbutions  of dividends and capital gains of
other  MFS  Funds  pursuant  to  the   Distribution   Investment   Program  (see
"Shareholder Services" in the Statement of Additional Information).

CLASS B SHARES: Class B shares are offered at net asset value without an initial
sales charge but subject to a CDSC as follows:

                   YEAR OF                           CONTINGENT
                  REDEMPTION                       DEFERRED SALES
                AFTER PURCHASE                         CHARGE
                --------------                     --------------
                    First ...........................   4%*
                    Second ..........................   4%
                    Third ...........................   3%
                    Fourth ..........................   3%
                    Fifth ...........................   2%
                    Sixth ...........................   1%
                    Seventh and following ...........   0%

*Class B shares purchased from January 1, 1993 through August 31, 1993 are
 subject to a CDSC of 5% in the event of a redemption within the first year
 after purchase.

For Class B shares  purchased  prior to January 1, 1993, the Fund imposes a CDSC
as a percentage of redemption proceeds as follows:

                  YEAR OF                            CONTINGENT
                 REDEMPTION                        DEFERRED SALES
               AFTER PURCHASE                          CHARGE
               --------------                      --------------
                    First ...........................   6%
                    Second ..........................   5%
                    Third ...........................   4%
                    Fourth ..........................   3%
                    Fifth ...........................   2%
                    Sixth ...........................   1%
                    Seventh and following ...........   0%

No CDSC is paid upon an exchange of shares. For purposes of calculating the CDSC
upon  redemption  of shares  acquired  in an  exchange,  the  purchase of shares
acquired in one or more  exchanges is deemed to have occurred at the time of the
original  purchase of the exchanged  shares.  See "Redemptions and Repurchases -
Contingent Deferred Sales Charge" for further discussion of the CDSC.

The CDSC on Class B shares  will be  waived  upon the  death or  disability  (as
defined in section  72(m)(7) of the Code) of any investor,  provided the account
is registered (i) in the case of a deceased  individual,  solely in the deceased
individual's name, (ii) in the case of a disabled individual,  solely or jointly
in the disabled individual's name or (iii) in the name of a living trust for the
benefit of the deceased or disabled individual.  The CDSC on Class B shares will
also be waived in the case of  redemptions  of shares of the Fund  pursuant to a
systematic  withdrawal  plan.  In  addition,  the CDSC on Class B shares will be
waived in the case of distributions from an IRA, SAR-SEP or any other retirement
plan qualified under section  401(a),  401(k) or 403(b) of the Code due to death
or disability,  or in the case of required minimum  distributions  from any such
retirement plan due to attainment of age 70-1/2. The CDSC on Class B shares will
be waived in the case of  distributions  from a retirement  planqualified  under
Section  401(a) of the Code due to (i)  returns  of excess  contribution  to the
plan, (ii)  retirement of a participant in the plan,  (iii) a borrowing from the
plan (repayments of borrowings,  however, will constitute new sales for purposes
of assessing the CDSC),  (iv)  "financial  hardship" of the  participant  in the
plan, as that term is defined in Treasury  Regulation Section  1.401(k)-1(d)(2),
as  amended  from  time  to  time,  and (v)  termination  of  employment  of the
participant in the plan (excluding,  however,  a partial or other termination of
the  plan).  The CDSC on Class B shares of the Fund  will  also be  waived  upon
redemptions by (i) officers of the Trust,  (ii) any of the subsidiary  companies
of Sun Life, (iii) eligible Directors,  officers,  employees  (including retired
and former  employees)  and agents of MFS,  Sun Life or any of their  subsidiary
companies, (iv) any trust, pension, profit-sharing or any other benefit plan for
such persons,  (v) any trustees and retired  trustees of any investment  company
for which FSI serves as distributor or principal  underwriter,  and (vi) certain
family members of such individuals and their spouses, provided in each case that
the  shares  will not be resold  except to the Fund.  The CDSC on Class B shares
will also be waived in the case of  redemptions  by any  employee or  registered
representative  of any dealer which has a dealer  agreement with FSI, by certain
family members of any such employee or  representative  and his or her spouse or
to any trust,  pension,  profit-sharing  or other  retirement  plan for the sole
benefit  of such  employee  or  representative  and by  clients of the MFS Asset
Management  Group. A retirement  plan qualified under section 401(a) of the Code
(a  "Retirement  Plan") that has invested its assets in Class B shares of one or
more of the MFS  Funds  for more  than 10 years  from the  later to occur of (i)
January 1, 1993 or (ii) the date the Retirement Plan first invests its assets in
Class B shares  of one or more of the MFS  Funds  will  have the CDSC on Class B
shares  waived in the case of a redemption of all the  Retirement  Plan's shares
(including  any Class A shares)  in all MFS Funds  (i.e.,  all the assets of the
Retirement  Plan  invested  in the MFS Funds  are  withdrawn),  except  that if,
immediately  prior to the  redemption,  the  aggregate  amount  invested  by the
Retirement Plan in Class B shares of the MFS Funds  (excluding the  reinvestment
of  distributions)  during the prior four year period  equals 50% or more of the
total value of the Retirement Plan's assets in the MFS Funds, then the CDSC will
not be waived.  The CDSC on Class B shares may also be waived in connection with
the  acquisition or liquidation of the assets of other  investment  companies or
personal holding companies.

CONVERSION OF CLASS B SHARES. Class B shares of the Fund that remain outstanding
for approximately eight years will convert to Class A shares of the Fund. Shares
purchased  through the reinvestment of distributions  paid in respect of Class B
shares  will be  treated as Class B shares for  purposes  of the  payment of the
distribution and service fees under the Distribution  Plan applicable to Class B
shares.  However,  for purposes of conversion to Class A shares, all shares in a
shareholder's  account that were purchased through the reinvestment of dividends
and  distributions  paid in  respect  of  Class B  shares  (and  which  have not
converted to Class A shares as provided in the following  sentence) will be held
in a  separate  sub-account.  Each time any Class B shares in the  shareholder's
account  (other  than those in the  sub-account)  convert  to Class A shares,  a
portion of the Class B shares then in the sub-account will also convert to Class
A shares.  The portion will be  determined  by the ratio that the  shareholder's
Class B shares not acquired through  reinvestment of dividends and distributions
that are  converting to Class A shares bear to the  shareholder's  total Class B
shares not acquired  through  reinvestment.  The conversion of Class B shares to
Class A shares is subject to the  continuing  availability  of a ruling from the
Internal  Revenue Service or an opinion of counsel that such conversion will not
constitute a taxable event for federal tax  purposes.  There can be no assurance
that such ruling or opinion will be  available,  and the  conversion  of Class B
shares  to  Class A shares  will not  occur if such  ruling  or  opinion  is not
available.  In such event, Class B shares would continue to be subject to higher
expenses than Class A shares for an indefinite period.

GENERAL:  If shares of the Fund are made available for sale, except as described
below,  the  minimum  initial  investment  is $1,000 per account and the minimum
additional  investment  is $50  per  account.  Accounts  being  established  for
participation  in the  Automatic  Exchange  Plan are subject to a $50 minimum on
initial and additional  investments per account.  Any minimums may be changed at
any time at the discretion of FSI. The Fund reserves the right to cease offering
shares at any time.

For shareholders who elect to participate in certain investment  programs (e.g.,
the  automatic  investment  plan)  or  other  shareholder  services  FSI  or its
affiliates  may  either (i) give a gift of nominal  value,  such as a  hand-held
calculator, or (ii) make a nominal charitable contribution on their behalf.

Although all MFS Funds are generally  available as an  investment  choice for an
IRA,  municipal bonds funds, such as the Fund, may not be suitable for inclusion
in an IRA due to their  tax-exempt  nature.  The minimum initial  investment for
IRAs is  $250  and the  minimum  additional  investment  is $50 per  account.  A
shareholder  should  consult his or her  financial or tax adviser  regarding any
such investment.

A  shareholder  whose  shares  are held in the name of,  or  controlled  by,  an
investment dealer might not receive many of the privileges and services from the
Fund  (such as Right of  Accumulation,  Letter of  Intent  and  certain  record-
keeping services) that the Fund ordinarily provides.

The Fund and FSI each reserve the right to reject any specific purchase order or
to  restrict   purchases  by  a  particular   purchaser  (or  group  of  related
purchasers).  The  Fund  or FSI  may  reject  or  restrict  any  purchases  by a
particular purchaser or group, for example, when a pattern of frequent purchases
and sales of shares of the Fund is evident,  or if the  purchase and sale orders
are, or a subsequent  abrupt  redemption  might be, of a size that would disrupt
management of the Fund.  The Fund and FSI intend  specifically  to exercise this
right in order to reject or restrict purchases by market timers (including asset
allocators)  and the  shareholder(s)  whose accounts are exchanged  periodically
based on an arrangement  with or advice from such persons or whose  transactions
seem to follow a timing pattern. In particular, action may be taken if: (i) more
than two exchange purchases are effected in a timed account in the same calendar
quarter;  or (ii) a purchase would result in shares being held in timed accounts
by an  individual or firm  representing  more than (x) one percent of the Fund's
net assets or (y) specified  dollar  amounts in the case of certain funds in the
MFS Funds,  which may  include  the Fund and which may change from time to time.
The Fund and FSI each reserve the right to request  holders of timed accounts to
redeem their shares at net asset value, less any CDSC otherwise  applicable,  if
either of these restrictions is violated.

Securities  dealers  and other  financial  institutions  may  receive  different
compensation with respect to sales of Class A and Class B shares.

The Glass-Steagall Act prohibits national banks from engaging in the business of
underwriting,  selling or  distributing  securities.  Although  the scope of the
prohibition has not been clearly defined,  FSI believes that such Act should not
preclude  banks from  entering  into agency  agreements  with FSI (as  described
above).  If, however,  a bank were prohibited from so acting, the Trustees would
consider  what  actions,  if any,  would be  necessary  to  continue  to provide
efficient  and  effective   shareholder   services.  It  is  not  expected  that
shareholders would suffer any adverse financial consequence as a result of these
occurrences.  In addition,  state  securities laws on this issue may differ from
the  interpretation  of federal  law  expressed  herein and banks and  financial
institutions  may be required to  register as  broker-dealers  pursuant to state
law.

EXCHANGES
Subject to the  requirements  set forth  below,  some or all of the shares in an
account with the Fund for which payment has been received by the Fund (i.e.,  an
established account) may be exchanged for shares of the same class of any of the
other MFS Funds (if available for sale) at net asset value.  Shares of one class
may not be exchanged for shares of any other class.  Exchanges will be made only
after  instructions  in writing or by  telephone  (an  "Exchange  Request")  are
received for an established account by the Shareholder Servicing Agent in proper
form (i.e., if in writing -- signed by the record owner(s) exactly as the shares
are registered; if by telephone -- proper account identification is given by the
dealer or  shareholder  of record) and each exchange must involve  either shares
having an aggregate value of at least $1,000 ($50 in the case of retirement plan
participants  whose  sponsoring  organizations  subscribe to the MFS FUNDamental
401(k) Plan or another similar 401(k) recordkeeping system made available by MFS
Service Center,  Inc.) or all the shares in the account.  If an Exchange Request
is received by the Shareholder  Servicing Agent on any business day prior to the
close of regular  trading on the New York Stock Exchange (the  "Exchange"),  the
exchange  usually will occur on that day if all the restrictions set forth above
have been complied with at that time. No more than five exchanges may be made in
any one Exchange Request by telephone.  Additional  information  concerning this
exchange  privilege  and  prospectuses  for any of the  other  MFS  Funds may be
obtained  from  investment  dealers  or  the  Shareholder   Servicing  Agent.  A
shareholder  should read the  prospectus  of the other MFS Fund and consider the
differences in objectives and policies  before making any exchange.  For federal
and (generally)  state income tax purposes,  an exchange is treated as a sale of
the shares exchanged and, therefore,  an exchange could result in a gain or loss
to the shareholder making the exchange. Exchanges by telephone are automatically
available  to most  non-retirement  plan  accounts and certain  retirement  plan
accounts.   For  further  information   regarding  exchanges  by  telephone  see
"Redemptions By Telephone".  The exchange privilege (or any aspect of it) may be
changed or discontinued and is subject to certain limitations, including certain
restrictions on purchases by market timer accounts (see "Purchases").

REDEMPTIONS AND REPURCHASES
A  shareholder  may  withdraw all or any portion of the amount in his account on
any date on which the Fund is open for business by redeeming shares at their net
asset  value  or by  selling  such  shares  to the  Fund  through  a  dealer  (a
repurchase).  Certain purchases,  however, may be subject to a CDSC in the event
of certain  redemption  transactions  (see  "Contingent  Deferred  Sales Charge"
below). For the convenience of shareholders, the Fund has arranged for different
procedures  for  redemption  and  repurchase.  The proceeds of a  redemption  or
repurchase  will normally be available  within seven days,  except that the Fund
will not make proceeds  available until checks  (including  certified  checks or
cashier's  checks)  received  as payment  for the  purchase  of the shares to be
redeemed have cleared.  Payment of redemption  proceeds may be delayed for up to
seven  days if the  Fund  determines  that  such a delay  would  be in the  best
interest of all its shareholders.

A.  REDEMPTION  BY MAIL -- Each  shareholder  has the right to redeem all or any
portion of the shares in his account by mailing or delivering to the Shareholder
Servicing  Agent  (see back  cover for  address)  a stock  power  with a written
request  for  redemption  or a letter of  instruction,  together  with his share
certificates  (if any were  issued),  all in "good  order" for  transfer.  "Good
order"  generally  means that the stock power,  written  request for redemption,
letter of  instruction  or share  certificate  must be  endorsed  by the  record
owner(s)  exactly as the  shares are  registered  and the  signature(s)  must be
guaranteed  in  the  manner  set  forth  below  under  the  caption   "Signature
Guarantee."  In addition,  in some cases "good order" may require the furnishing
of additional  documents.  The  Shareholder  Servicing Agent may make certain de
minimis exceptions to the above  requirements for redemption.  Within seven days
after  receipt of a redemption  request by the  Shareholder  Servicing  Agent in
"good  order," the Fund will make  payment in cash of the net asset value of the
shares next determined  after such redemption  request was received,  reduced by
the amount of any  applicable  CDSC and the amount of any income tax required to
be  withheld,  except  during  any  period in which the right of  redemption  is
suspended  or date of payment is  postponed  because  the  Exchange is closed or
trading on the Exchange is restricted or, to the extent  otherwise  permitted by
the 1940 Act, if an emergency exists.

B.  REDEMPTION  BY TELEPHONE -- Each  shareholder  may redeem an amount from his
account by  telephoning  toll-free at (800)  225-2606.  Shareholders  wishing to
avail themselves of this telephone  redemption  privilege must so elect on their
Account  Application,  designate thereon a commercial bank and account number to
receive the proceeds of such redemption,  and sign the Account  Application Form
with the signature(s) guaranteed in the manner set forth below under the caption
"Signature Guarantee". The proceeds of such a redemption,  reduced by the amount
of any applicable CDSC described above and the amount of any income tax required
to be withheld,  are mailed by check to the designated account,  without charge.
As a special service, investors may arrange to have proceeds in excess of $1,000
wired in federal  funds to the  designated  account.  If a telephone  redemption
request is received by the  Shareholder  Servicing Agent by the close of regular
trading on the  Exchange  on any  business  day,  shares will be redeemed at the
closing  net asset  value of the Fund on that  day.  Subject  to the  conditions
described in this section, proceeds of a redemption are normally mailed or wired
on the  next  business  day  following  the date of  receipt  of the  order  for
redemption.  The  Shareholder  Servicing  Agent will not be responsible  for any
losses  resulting  from  unauthorized   telephone  transactions  if  it  follows
reasonable  procedures  designed  to verify  the  identity  of the  caller.  The
Shareholder  Servicing Agent will request personal or other information from the
caller,  and will  normally also record  calls.  Shareholders  should verify the
accuracy of confirmation statements immediately after their receipt.

C. REPURCHASE THROUGH A DEALER -- If a shareholder desires to sell his shares at
net asset value through his securities  dealer (a  repurchase),  the shareholder
can place a repurchase  order with his dealer,  who may charge the shareholder a
fee.  IF THE  DEALER  RECEIVES  THE  SHAREHOLDER'S  ORDER  PRIOR TO THE CLOSE OF
REGULAR  TRADING  ON THE  EXCHANGE  AND  COMMUNICATES  IT TO FSI ON THE SAME DAY
BEFORE FSI CLOSES FOR BUSINESS, THE SHAREHOLDER WILL RECEIVE THE NET ASSET VALUE
CALCULATED  ON THAT DAY,  REDUCED BY THE AMOUNT OF ANY  APPLICABLE  CDSC AND THE
AMOUNT OF ANY INCOME TAX REQUIRED TO BE WITHHELD.

SIGNATURE  GUARANTEE:  In order to  protect  shareholders  against  fraud to the
greatest extent  possible,  the Fund requires in certain  instances as indicated
above  that the  shareholder's  signature  be  guaranteed.  In these  cases  the
shareholder's  signature must be guaranteed by an eligible bank, broker, dealer,
credit union, national securities exchange,  registered securities  association,
clearing agency or savings  association.  Signature guarantees shall be accepted
in accordance with policies established by the Shareholder Servicing Agent.

Shareholders of the Fund who have redeemed their shares have a one-time right to
reinvest the  redemption  proceeds in the same class of shares of any of the MFS
Funds (if shares of such Fund are available for sale) at net asset value (with a
credit  for any CDSC  paid)  within 90 days of the  redemption  pursuant  to the
Reinstatement  Privilege.  If the  shares  credited  for any CDSC  paid are then
redeemed within six years of the initial purchase in the case of Class B shares,
or within 12 months of the initial purchase for certain Class A share purchases,
a CDSC will be imposed upon redemption.  Such purchases under the  Reinstatement
Privilege  are  subject  to all  limitations  in  the  Statement  of  Additional
Information regarding this privilege.

Subject to the  Fund's  compliance  with  applicable  regulations,  the Fund has
reserved the right to pay the  redemption or  repurchase  price of shares of the
Fund,  either  totally or  partially,  by a  distribution  in kind of securities
(instead of cash) from the Fund's portfolio.  The securities distributed in such
a  distribution  would be valued at the same amount as that  assigned to them in
calculating  the net asset  value for the shares  being sold.  If a  shareholder
receives a  distribution  in kind,  the  shareholder  could incur  brokerage  or
transaction charges in converting the securities to cash.

Due to the relatively high cost of maintaining small accounts, the Fund reserves
the right to redeem  shares in any account for their  then-current  value (which
will be promptly paid to the shareholder) if at any time the total investment in
such  account  drops below $500  because of  redemptions,  except in the case of
accounts  established  for monthly  automatic  investments  and certain  payroll
savings  programs  and the  Automatic  Exchange  Plan for which there is a lower
minimum investment requirement (see "Purchases").  Shareholders will be notified
that the value of their account is less than the minimum investment  requirement
and allowed 60 days to make an additional  investment  before the  redemption is
processed. No CDSC will be imposed with respect to such involuntary redemptions.

CONTINGENT  DEFERRED  SALES CHARGE.  Investments  ("Direct  Purchases")  will be
subject  to a CDSC for a period of 12  months  (in the case of  purchases  of $1
million  or more of Class A shares)  or six years (in the case of  purchases  of
Class B shares).  Purchases  of Class A shares  made  during a  calendar  month,
regardless of when during the month the investment occurred,  will age one month
on the last day of the month and each subsequent month. Class B shares purchased
on or after January 1, 1993 will be aggregated on a calendar  month basis -- all
transactions  made during a calendar month,  regardless of when during the month
they have  occurred,  will age one year at the close of business on the last day
of such month in the following calendar year and each subsequent year. For Class
B shares of the Fund purchased  prior to January 1, 1993,  transactions  will be
aggregated on a calendar year basis -- all  transactions  made during a calendar
year,  regardless of when during the year they have occurred,  will age one year
at the close of business on December 31 of that year and each  subsequent  year.
At the time of a  redemption,  the amount by which the value of a  shareholder's
account for a particular class  represented by Direct Purchases  exceeds the sum
of the six calendar year  aggregations (12 months in the case of purchases of $1
million or more of Class A shares) of Direct  Purchases may be redeemed  without
charge ("Free Amount").  Moreover, no CDSC is ever assessed on additional shares
acquired  through  the  automatic  reinvestment  of  dividends  or capital  gain
distributions ("Reinvested Shares").

Therefore,  at the time of redemption of shares of a particular  class,  (i) any
Free  Amount is not subject to the CDSC,  and (ii) the amount of the  redemption
equal to the then-current value of Reinvested Shares is not subject to the CDSC,
but  (iii) any  amount of the  redemption  in  excess  of the  aggregate  of the
then-current  value of  Reinvested  Shares  and the Free  Amount is subject to a
CDSC.  The CDSC will first be  applied  against  the amount of Direct  Purchases
which will result in any such charge being imposed at the lowest  possible rate.
The CDSC to be imposed  upon  redemptions  of shares will be  calculated  as set
forth in "Purchases" above.

The  applicability  of a CDSC will be  unaffected  by  exchanges or transfers of
registration.

DISTRIBUTION PLAN
The Trustees  have adopted a  distribution  plan for Class B shares  pursuant to
Section  12(b) of the 1940 Act and Rule  12b-1  thereunder  (the  "Rule")  after
having  concluded  that  there is a  reasonable  likelihood  that the plan would
benefit the Fund and the Class B shareholders. There is no distribution plan for
Class A shares.

     CLASS B DISTRIBUTION  PLAN. The Class B Distribution Plan provides that the
Fund will pay FSI a daily  distribution fee equal on an annual basis to 0.75% of
the  Fund's  average  daily net  assets  attributable  to Class B shares and may
annually  pay FSI a service fee of up to 0.25% of the Fund's  average  daily net
assets  attributable to Class B shares (which FSI will in turn pay to securities
dealers which enter into a sales  agreement with FSI at a rate of up to 0.25% of
the Fund's  average  daily net assets  attributable  to Class B shares  owned by
investors  for whom that  securities  dealer is the holder or dealer of record).
This  service fee is intended to be  additional  consideration  for all personal
services and/or account maintenance services rendered by the dealer with respect
to Class B shares.  Fees payable under the Class B Distribution Plan are charged
to, and therefore reduce, income allocated to Class B shares. Except in the case
of the first year service fee, no service fee will be paid. This  elimination of
the service fee may be amended or terminated without notice to shareholders. The
first year  service fee will be paid as noted  below.  The Class B  Distribution
Plan also  provides  that FSI will  receive  all CDSCs  attributable  to Class B
shares which do not reduce the  distribution  fee. FSI will pay  commissions  to
dealers of 3.75% of the purchase price of shares purchased through dealers.  FSI
will also advance to dealers the first year service fee at a rate equal to 0.25%
of the  purchase  price of such shares and, as  compensation  therefor,  FSI may
retain the  service  fee paid by the Fund with  respect  to such  shares for the
first year after purchase. Therefore, the total amount paid to a dealer upon the
sale of shares is 4.00% of the purchase price of the shares  (commission rate of
3.75% plus a service fee equal to 0.25% of the  purchase  price).  Dealers  will
become  eligible  for  additional  service  fees  with  respect  to such  shares
commencing in the thirteenth month following purchase.  Dealers may from time to
time be required to meet certain  criteria in order to receive service fees. FSI
or its  affiliates  are entitled to retain all service  fees  payable  under the
Class B  Distribution  Plan for which  there is no dealer of record or for which
qualification  standards have not been met as partial consideration for personal
services and/or account maintenance  services performed by FSI or its affiliates
for shareholder accounts.  The purpose of the distribution payments to FSI under
the Class B Distribution Plan is to compensate FSI for its distribution services
to the Fund. Since FSI's compensation is not directly tied to its expenses,  the
amount of compensation  received by FSI during any year may be more or less than
its actual expenses.  For this reason, this type of distribution fee arrangement
is characterized by the staff of the SEC as being of the "compensation" variety.
However,  the Fund is not liable for any  expenses  incurred by FSI in excess of
the amount of compensation it receives.  The expenses incurred by FSI, including
commissions to dealers,  are likely to be greater than the distribution fees for
the next several years, but thereafter such expenses may be less than the amount
of the distribution  fees.  Certain banks and other financial  institutions that
have agency agreements with FSI will receive agency transaction and service fees
that are the same as commissions and service fees to dealers.

DISTRIBUTIONS
The Fund intends to pay  substantially  all of its net investment  income to its
shareholders  as dividends on a monthly basis. In determining the net investment
income  available for  distributions,  the Fund may rely on  projections  of its
anticipated net investment income over a longer term, rather than its actual net
investment  income  for the  period in order to  provide  more  stable  periodic
distributions.  The Fund may make one or more distributions  during the calendar
year to its shareholders  from any long-term capital gains and may also make one
or  more  distributions  during  the  calendar  year  to its  shareholders  from
short-term  capital  gains.  Shareholders  may elect to  receive  dividends  and
capital gain distributions in either cash or additional shares of the same class
with respect to which a distribution is made. See "Tax Status" and  "Shareholder
Services --  Distribution  Options" below.  Distributions  paid by the Fund with
respect to Class A shares will generally be greater than those paid with respect
to Class B shares because expenses attributable to Class B shares will generally
be higher.

TAX STATUS
The Fund is treated as an entity separate from the other series of the Trust for
federal  income  tax  purposes.  In order to  minimize  the taxes the Fund would
otherwise  be  required  to pay,  the Fund  intends  to  qualify  each year as a
"regulated  investment  company"  under  Subchapter  M of the Code,  and to make
distributions  to its  shareholders in accordance  with the timing  requirements
imposed by the Code.  It is  expected  that the Fund will not be required to pay
entity level federal income or excise taxes. Because the Fund intends to satisfy
certain  requirements  of  the  Code,  the  Fund  expects  to pay  dividends  to
shareholders  from interest on Municipal  Bonds that are  generally  exempt from
federal income tax. From time to time a portion of the Fund's distributions will
be taxable to shareholders  (e.g.,  distributions  of income from investments in
taxable securities, including repurchase agreements, income from transactions in
certain Municipal Bonds purchased at a market discount,  and certain other short
term  investments  and of capital gains  realized by the Fund,  including  gains
recognized  from  options  and  futures  transactions,  whether  paid in cash or
reinvested in additional shares. Depending on the nature of the distribution and
the residence of the shareholder,  certain Fund  distributions may be subject to
state and local income  taxes;  shareholders  should  consult with their own tax
advisors in this regard.

A  statement  setting  forth the  federal  income  status of all  dividends  and
distributions  for that year,  including any portion taxable as ordinary income,
the portion exempted from federal income tax as "exempt-interest dividends," any
portion that is a tax preference  item for purposes of the  alternative  minimum
tax,  the portion  taxable as long-term  capital  gains,  the  portion,  if any,
representing a return of capital (which is generally free of taxes,  but results
in a basis  reduction),  and the amount,  if any, of federal income tax withheld
will be sent to each shareholder promptly after the end of such year.

Current federal tax law limits the types and volume of bonds  qualifying for the
federal  income  tax  exemption  of  interest  and  makes  interest  on  certain
tax-exempt bonds and distributions by the Fund of such interest a tax preference
item for purposes of the individual and corporate  alternative  minimum tax. All
exempt-interest  dividends  may  affect a  corporate  shareholder's  alternative
minimum tax liability.

Interest on indebtedness incurred by shareholders to purchase or carry shares of
the Fund  will not be  deductible  for  federal  income  tax  purposes.  Exempt-
interest  dividends are taken into account in  calculating  the amount of social
security and railroad  retirement benefits that may be subject to federal income
tax.  Entities or persons  who are  "substantial  users" (or persons  related to
"substantial  users") of facilities  financed by certain private  activity bonds
should  consult  their  tax  advisers  before  purchasing  shares  of the  Fund.
"Substantial  user" is defined generally as including a "non-exempt  person" who
regularly  uses in trade or  business  a part of a  facility  financed  from the
proceeds of certain private activity bonds.

The Fund intends to withhold U.S.  federal  income tax at the rate of 30% on any
taxable  dividends and other payments that are subject to such  withholding  and
that are made to persons who are neither  citizens  nor  residents  of the U.S.,
regardless of whether a lower rate may be permitted under an applicable  treaty.
The Fund is also required in certain  circumstances to apply backup  withholding
of 31% on taxable  dividends and  redemption  proceeds  paid to any  shareholder
(including  a  shareholder  who is neither a citizen nor a resident of the U.S.)
who does not furnish to the Fund certain  information and  certifications or who
is otherwise subject to backup withholding. However, backup withholding will not
be applied to payments which have been subject to 30% withholding.

Prospective  investors should read the Fund's Account Application for additional
information  regarding  backup  withholding  of  federal  income  tax and should
consult  their  own  tax  advisors  as to the  tax  consequences  to  them of an
investment in the Fund.

NET ASSET VALUE
The net asset value per share of each class of shares of the Fund is  determined
each day during which the Exchange is open for trading.  This  determination  is
made  once  during  each  such day as of the  close of  regular  trading  on the
Exchange by deducting the amount of the  liabilities  attributable  to the class
from the value of the Fund's assets  attributable  to the class and dividing the
difference  by the  number of shares  of the  class  outstanding.  Assets in the
Fund's portfolio are valued on the basis of their market or other fair value, as
described in the  Statement of  Additional  Information.  The net asset value of
each class of shares is effective for orders received by the dealer prior to its
calculation and received by FSI prior to the close of business on that day.

DESCRIPTION OF SHARES, VOTING RIGHTS AND LIABILITIES 
The Fund,  one of two series of the Trust,  has two classes of shares,  entitled
Class A and Class B Shares of Beneficial Interest (without par value). The Trust
has  reserved  the right to create and issue  additional  classes  and series of
shares, in which case each class of shares of a series would participate equally
in the  earnings,  dividends  and  assets  attributable  to that  class  of that
particular series. Shareholders are entitled to one vote for each share held and
shares of each series would be entitled to vote separately to approve investment
advisory  agreements  or changes in investment  restrictions,  but shares of all
series  would vote  together in the  election of Trustees  and  ratification  of
selection of  accountants.  Additionally,  each class of shares of a series will
vote separately on any material  increases in the fees under its Rule 12b-1 plan
or on any other  matter  that  affects  solely  that class of  shares,  but will
otherwise  vote  together  with all other classes of shares of the series on all
other matters.  The Trust does not intend to hold annual  shareholder  meetings.
The  Declaration  of Trust provides that a Trustee may be removed from office in
certain instances (see "Description of Shares, Voting Rights and Liabilities" in
the Statement of Additional Information).

Each share of a class of the Fund represents an equal proportionate  interest in
the Fund  with  each  other  class  share,  subject  to the  liabilities  of the
particular class. Shares have no pre-emptive or conversion rights (except as set
forth above in "Purchases Conversion of Class B Shares"). Shares of the Fund are
fully paid and  non-assessable.  Should the Fund be liquidated,  shareholders of
each class would be entitled to share pro rata in the net assets attributable to
that class  available for  distribution to  shareholders.  Shares will remain on
deposit with the Shareholder Servicing Agent and certificates will not be issued
except in connection  with pledges and  assignments and in certain other limited
circumstances.

The Trust is an entity of the type commonly known as a  "Massachusetts  business
trust". Under Massachusetts law, shareholders of such a trust may, under certain
circumstances,  be held  personally  liable  as  partners  for its  obligations.
However,  the risk of a  shareholder  incurring  financial  loss on  account  of
shareholder  liability  is limited  to  circumstances  in which both  inadequate
insurance existed (e.g., fidelity bonding and errors and omission insurance) and
the Trust itself was unable to meet its obligations.

PERFORMANCE INFORMATION
From time to time,  the Fund will  provide  yield,  current  distribution  rate,
tax-equivalent  yield and  total  rate of return  quotations  for each  class of
shares and may also quote fund  rankings  in the  relevant  fund  category  from
various sources,  such as the Lipper Analytical Services,  Inc. and Wiesenberger
Investment  Companies Service. Any yield and tax-equivalent yield quotations are
based on the annualized net investment  income per share allocated to each class
of the Fund  over a 30-day  period  stated as a percent  of the  maximum  public
offering price of that class on the last day of that period.  Yield calculations
for Class B shares  assume no CDSC is paid.  The current  distribution  rate for
each class is generally  based upon the total amount of dividends per share paid
by the Fund to  shareholders  of that class during the past twelve months and is
computed by dividing the amount of such dividends by the maximum public offering
price  of that  class  at the  end of such  period.  Current  distribution  rate
calculations for Class B shares assume no CDSC is paid. The current distribution
rate differs from the yield calculation because it may include  distributions to
shareholders  from sources other than  dividends  and interest,  such as premium
income from option  writing,  short-term  capital gains,  and return of invested
capital, and is calculated over a different period of time. Total rate of return
quotations  reflect the average annual  percentage change over stated periods in
the  value of an  investment  in each  class of  shares  of the Fund made at the
maximum public offering price of the shares of that class with all distributions
reinvested  and  which,  if quoted for  periods of six years or less,  will give
effect to the  imposition of the CDSC assessed  upon  redemptions  of the Fund's
Class B shares.  Such  total rate of return  quotations  may be  accompanied  by
quotations which do not reflect the reduction in value of the initial investment
due to the  sales  charge or the  deduction  of a CDSC,  and which  will thus be
higher. All performance  quotations are based on historical  performance and are
not intended to indicate  future  performance.  Yield and  tax-equivalent  yield
reflect only net portfolio  income  allocable to a class as of a stated time and
current  distribution  rate reflects only the rate of distributions  paid by the
Fund over a stated  period of time  while  total  rate of  return  reflects  all
components  of  investment  return  over a stated  period  of time.  The  Fund's
quotations may from time to time be used in advertisements,  shareholder reports
or other communications to shareholders. For a discussion of the manner in which
the Fund will calculate its yield,  current  distribution  rate,  tax-equivalent
yield and total rate of return, see the Statement of Additional Information.  In
addition to information  provided in shareholder  reports,  the Fund may, in its
discretion,  from time to time,  make a list of all or a portion of its holdings
available to investors upon request.


8.  SHAREHOLDER SERVICES
Shareholders with questions  concerning the shareholder services described below
or concerning other aspects of the Fund should contact the Shareholder Servicing
Agent (see back cover for address and phone number).

ACCOUNT  AND   CONFIRMATION   STATEMENTS  --  Each   shareholder   will  receive
confirmation  statements showing the transaction activity in his account. At the
end of each calendar year each  shareholder  will receive income tax information
regarding the tax status of all reportable  dividends and distributions for that
year.

DISTRIBUTION  OPTIONS -- The  following  options are  available  to all accounts
(except  Systematic  Withdrawal  Plan  accounts)  and may be changed as often as
desired by notifying the Shareholder Servicing Agent:

     -- Dividends  and  capital  gain  distributions  reinvested  in  additional
        shares. This option will be assigned if no other option is specified.

     -- Dividends  (including  short-term  capital  gains)  in  cash;  long-term
        capital gain distributions reinvested in additional shares.

     -- Dividends and capital gain distributions in cash.

Reinvestments  (net  of any tax  withholding)  of  dividends  and  capital  gain
distributions  will be made in additional full and fractional shares of the same
class of  shares  of the Fund at the net  asset  value in effect at the close of
business on the record  date.  Dividends  and  capital  gains  distributions  in
amounts less than $10 will  automatically be reinvested in additional  shares of
the Fund.  Any request for an option change must be received by the  Shareholder
Servicing Agent by the record date for a dividend or distribution in order to be
effective for that dividend or distribution.  No interest will accrue on amounts
represented by uncashed distribution or redemption checks.

INVESTMENT AND WITHDRAWAL  PROGRAMS -- For the convenience of shareholders,  the
Fund makes available the following  programs designed to enable  shareholders to
add to their  investment  in an account with the Fund or withdraw from it with a
minimum of paper work.  The  programs  involve no extra  charge to  shareholders
(other than a sales charge in the case of certain Class A share  purchases)  and
may be changed or discontinued at any time by a shareholder or the Fund.

     LETTER  OF  INTENT:  If a  shareholder  (other  than a group  purchaser  as
described in the Statement of  Additional  Information)  anticipates  purchasing
$100,000  or more of Class A shares  of the Fund  alone or in  combination  with
shares  of Class B of the Fund or any of the  classes  of other MFS Funds or MFS
Fixed Fund (a bank  collective  investment  fund)  within a 13-month  period (or
36-month period for purchases of $1 million or more), the shareholder may obtain
such  shares of the Fund at the same  reduced  sales  charge as though the total
quantity were  invested in one lump sum,  subject to escrow  agreements  and the
appointment  of an  attorney  for  redemptions  from the  escrow  amount  if the
intended purchases are not completed, by completing the Letter of Intent section
of the Account Application.

     RIGHT OF  ACCUMULATION:  A shareholder  qualifies for  cumulative  quantity
discounts on purchases of Class A shares when his new investment,  together with
the current  offering  price  value of all  holdings of all classes of shares of
that  shareholder  in the  MFS  Funds  or MFS  Fixed  Fund  (a  bank  collective
investment fund) reaches a discount level.

     DISTRIBUTION  INVESTMENT PROGRAM:  Shares of a particular class of the Fund
may be sold at net asset value (and  without any  applicable  CDSC)  through the
automatic  reinvestment of distributions of dividends and capital gains from the
same class of another MFS Fund. Furthermore,  distributions made by the Fund may
be automatically  invested at net asset value in shares of the same class of any
other MFS Fund,  if shares of such  Fund are  available  for sale  (without  any
applicable CDSC).

     SYSTEMATIC WITHDRAWAL PLAN: A shareholder (except a $3 Million Shareholder)
may direct the Shareholder Servicing Agent to send him (or anyone he designates)
regular periodic  payments,  as designated on the Account  Application and based
upon the value of his account.  Each payment under a Systematic  Withdrawal Plan
(a "SWP") must be at least $100,  except in certain limited  circumstances.  The
aggregate  withdrawals  of Class B shares in any year pursuant to a SWP will not
be  subject  to a CDSC and  generally  are  limited  to 10% of the  value of the
account at the time of the establishment of the SWP. The CDSC will not be waived
in the case of SWP redemptions of Class A shares which are subject to a CDSC.

DOLLAR COST AVERAGING PROGRAMS --
     AUTOMATIC  INVESTMENT  PLAN:  Cash  investments  of $50 or more may be made
through a shareholder's  checking  account twice monthly,  monthly or quarterly.
Required forms are available from the Shareholder  Servicing Agent or investment
dealers.

     AUTOMATIC EXCHANGE PLAN:  Shareholders  having account balances of at least
$5,000 in any MFS Fund may exchange their shares for shares of the same class of
shares of the other MFS Funds under the Automatic  Exchange  Plan. The Automatic
Exchange Plan provides for automatic  transfers of funds from the  shareholder's
account in an MFS Fund for  investment  in the same class of shares of other MFS
Funds selected by the shareholder.  Under the Automatic Exchange Plan, transfers
of at least $50 each may be made to up to four  different  funds.  A shareholder
should  consider the objectives and policies of a fund and review its prospectus
before electing to transfer money into such fund through the Automatic  Exchange
Plan. No  transaction  fee is imposed in connection  with transfer  transactions
under the Automatic  Exchange  Plan.  However,  transfers of shares of MFS Money
Market  Fund,  MFS  Government  Money Market Fund and Class A shares of MFS Cash
Reserve Fund will be subject to any  applicable  sales  charge.  For federal and
(generally)  state income tax  purposes,  a transfer is treated as a sale of the
shares transferred and, therefore, could result in a capital gain or loss to the
shareholder making the transfer. See the Statement of Additional Information for
further  information  concerning the Automatic  Exchange Plan.  Investors should
consult their tax advisers for information  regarding the potential capital gain
and loss consequences of transactions under the Automatic Exchange Plan.

Because a dollar cost averaging  program involves  periodic  purchases of shares
regardless of fluctuating  share offering prices, a shareholder  should consider
his  financial  ability to continue  his purchase  through  periods of low price
levels.  Maintaining  a  dollar  cost  averaging  program  concurrently  with  a
withdrawal  program  could  be  disadvantageous  because  of the  sales  charges
included in share purchases.

The  Statement of  Additional  Information,  dated June 1, 1994,  contains  more
detailed information about the Trust and the Fund including  information related
to (i) investment  policies and  restrictions,  (ii) the Trustees,  officers and
investment adviser, (iii) portfolio transactions and brokerage commissions, (iv)
the  method  used to  calculate  yield,  tax-equivalent  yield and total rate of
return  quotations  of the  Fund,  (v) the  Distribution  Plan and (vi)  various
services  and   privileges   provided  by  the  Fund  for  the  benefit  of  its
shareholders,  including  additional  information  with  respect to the exchange
privilege.

<PAGE>

                                  APPENDIX A
                        TAXABLE EQUIVALENT YIELD TABLE
              (UNDER FEDERAL INCOME TAX LAW AND RATES FOR 1994)

     The table  below  shows  the  approximate  taxable  bond  yields  which are
equivalent to tax-exempt bond yields from 3% to 8% under federal income tax laws
that  apply to 1994.  (Such  yields  may  differ  under the laws  applicable  to
subsequent years.) Separate calculations,  showing the applicable taxable income
brackets,  are  provided  for  investors  who file joint  returns  and for those
investors who file individual returns.

<TABLE>
<CAPTION>
 
  SINGLE RETURN     JOINT RETURN
  -------------     ------------         INCOME                           TAX-EXEMPT YIELD
           (TAXABLE INCOME)<F1>            TAX       ---------------------------------------------------------
                                         BRACKET     3%          4%         5%         6%         7%        8%
  ------------------------------         -------     ---------------------------------------------------------
1994                 1994                                         EQUIVALENT TAXABLE YIELD
<S>                  <C>                 <C>        <C>         <C>       <C>        <C>         <C>       <C>

$      0-$ 22,750    $      0-$ 38,000   15.00%     3.53%       4.71%      5.88%      7.06%      8.24%     9.41%
$ 22,751-$ 55,100    $ 38,001-$ 91,850   28.00      4.17        5.56       6.94       8.33       9.72      11.11
$ 55,101-$115,000    $ 91,851-$140,000   31.00      4.35        5.80       7.25       8.70       10.14     11.59
$115,000-$250,000    $140,001-$250,000   36.00      4.69        6.25       7.81       9.38       10.94     12.50
$250,000 & Over      $250,000 & Over     39.60      4.97        6.62       8.28       9.93        11.59    13.25

<FN>
<F1> Net amount subject to Federal income tax after deductions and exemptions.
</TABLE>

                                   APPENDIX B

                         DESCRIPTION OF MUNICIPAL BONDS

     Municipal Bonds include debt obligations issued to obtain funds for various
public purposes, including the construction of a wide range of public facilities
such as bridges,  highways,  housing,  hospitals, mass transportation,  schools,
streets and water and sewer  works.  Other public  purposes for which  Municipal
Bonds may be issued include refunding outstanding  obligations,  obtaining funds
for general  operating  expenses,  and  obtaining  funds to loan to other public
institutions   and  facilities.   In  addition,   certain  types  of  industrial
development  bonds are  issued by or on behalf of public  authorities  to obtain
funds to  provide  privately-operated  housing  facilities,  sports  facilities,
convention or trade show  facilities,  airport,  mass  transit,  port or parking
facilities,  air  or  water  pollution  control  facilities  and  certain  local
facilities for water supply, gas, electricity or sewage or solid waste disposal.
Such  obligations  are included  within the term Municipal Bonds if the interest
paid  thereon  qualifies  as exempt from federal  income  taxes.  Other types of
industrial   development   bonds,  the  proceeds  of  which  are  used  for  the
construction,  equipment, repair or improvement of privately operated industrial
or commercial  facilities,  may constitute Municipal Bonds, although the current
federal tax laws place substantial limitations on the size of such issues.

     The  two  principal   classifications   of  Municipal  Bonds  are  "general
obligation" and "revenue"  bonds.  General  obligation  bonds are secured by the
issuer's  pledge of its good faith,  credit and taxing  power for the payment of
principal  and  interest.  The  payment of such bonds may be  dependent  upon an
appropriation  by  the  issuer's   legislative  body.  The  characteristics  and
enforcement of general  obligation bonds vary according to the law applicable to
the particular issuer.  Revenue bonds are payable only from the revenues derived
from a particular  facility or class of facilities  or, in some cases,  from the
proceeds  of a  special  excise or other  specific  revenue  source.  Industrial
development  bonds which are Municipal Bonds are in most cases revenue bonds and
do not  generally  constitute  the  pledge of the  credit of the  issuer of such
bonds.  Municipal Bonds also include  participations in municipal leases.  These
are undivided  interests in a portion of an obligation in the form of a lease or
installment  purchase which is issued by state and local  governments to acquire
equipment and  facilities.  Municipal  leases  frequently have special risks not
normally  associated  with  general  obligation  or  revenue  bonds.  Leases and
installment  purchase or conditional  sale contracts (which normally provide for
title to the leased asset to pass  eventually to the  governmental  issuer) have
evolved as a means for  governmental  issuers to acquire  property and equipment
without meeting the constitutional  and statutory  requirements for the issuance
of debt. The debt-issuance  limitations are deemed to be inapplicable because of
the  inclusion in many leases or contracts of  "non-appropriation"  clauses that
provide that the  governmental  issuer has no obligation to make future payments
under the lease or contract unless money is appropriated for such purpose by the
appropriate  legislative body on a yearly or other periodic basis.  Although the
obligations  will  be  secured  by  the  leased  equipment  or  facilities,  the
disposition  of the  underlying  property in the event of  non-appropriation  or
foreclosure might, in some cases,  prove difficult.  In light of these concerns,
the  staff of the SEC has  advised  investment  companies  to adopt  and  follow
procedures for  determining  whether  municipal lease  securities  purchased are
liquid and for monitoring the liquidity of municipal  lease  securities  held in
such company's portfolio.  The Board of Trustees has adopted such procedures and
has  delegated  to the  Adviser  the  authority  to make  determinations  on the
liquidity of municipal lease  securities in accordance with the procedures.  The
procedures  require that the Adviser use a number of factors in calculating  the
liquidity of a municipal lease security,  including, the frequency of trades and
quotes for the security,  the number of dealers  willing to purchase or sell the
security  and the  number of other  potential  purchasers,  the  willingness  of
dealers  to  undertake  to make a market  in the  security,  the  nature  of the
marketplace in which the security trades, the credit quality of the security and
other  factors  which the  Adviser  may deem  relevant.  There  are,  of course,
variations  in the  security  of  Municipal  Bonds,  both  within  a  particular
classification and between classifications, depending on numerous factors.

The yields on Municipal  Bonds are dependent on a variety of factors,  including
general money market conditions, supply and demand and general conditions of the
Municipal  Bond  market,  size of a  particular  offering,  the  maturity of the
obligation and rating of the issue.

                     DESCRIPTION OF MUNICIPAL BOND RATINGS

The ratings of Moody's  and S&P  represent  their  opinions as to the quality of
various debt instruments.

                        MOODY'S INVESTORS SERVICE, INC.

AAA: Bonds which are rated Aaa are judged to be of the best quality.  They carry
the smallest  degree of investment  risk and are generally  referred to as "gilt
edge." Interest payments are protected by a large or by an exceptionally  stable
margin and principal is secure. While the various protective elements are likely
to change,  such changes as can be  visualized  are most  unlikely to impair the
fundamentally strong position of such issues.

AA: Bonds which are rated Aa are judged to be of high quality by all  standards.
Together with the Aaa group they comprise what are generally known as high grade
bonds.  They are rated lower than the best bonds  because  margins of protection
may not be as large as in Aaa securities or  fluctuation of protective  elements
may be of greater  amplitude or there may be other  elements  present which make
the long-term risks appear somewhat larger than in Aaa securities.

A: Bonds which are rated A possess many favorable investment  attributes and are
to be considered as upper medium grade  obligations.  Factors giving security to
principal  and interest  are  considered  adequate,  but elements may be present
which suggest a susceptibility to impairment sometime in the future.

BAA: Bonds which are rated Baa are considered as medium grade obligations, i.e.,
they are neither  highly  protected nor poorly  secured.  Interest  payments and
principal  security  appear  adequate  for the present  but  certain  protective
elements may be lacking or may be  characteristically  unreliable over any great
length of time. Such bonds lack outstanding  investment  characteristics  and in
fact have speculative characteristics as well.

BA:  Bonds  which are rated Ba are judged to have  speculative  elements;  their
future cannot be considered  as well assured.  Often the  protection of interest
and  principal  payments may be very  moderate and thereby not well  safeguarded
during  both  good  and bad  times  over the  future.  Uncertainty  of  position
characterizes bonds in this class.

B: Bonds  which are rated B  generally  lack  characteristics  of the  desirable
investment.  Assurance of interest and principal  payments or of  maintenance of
other terms of the contract over any long period of time may be small.

CAA:  Bonds  which are rated Caa are of poor  standing.  Such  issues  may be in
default or there may be present  elements of danger with respect to principal or
interest.

CA: Bonds which are rated Ca represent  obligations  which are  speculative in a
high degree. Such issues are often in default or have other marked shortcomings.

C:  Bonds  which are rated C are the lowest  rated  class of bonds and issues so
rated can be regarded as having  extremely  poor prospects of ever attaining any
real investment standing.

CON. (...): Bonds for which the security depends upon the completion of some act
or the  fulfillment of some condition are rated  conditionally.  These are bonds
secured by (a) earnings of projects under construction, (b) earnings of projects
unseasoned in operation experience,  (c) rentals which begin when facilities are
completed,  or (d)  payments to which some other  limiting  condition  attaches.
Parenthetical   rating  denotes  probable  credit  stature  upon  completion  of
construction or elimination of basis of condition.

ABSENCE OF RATING:  Where no rating has been assigned or where a rating has been
suspended or  withdrawn,  it may be for reasons  unrelated to the quality of the
issue. Should no rating be assigned, the reason may be one of the following:

   1. An application for rating was not received or accepted.
   2. The issue or issuer belongs to a group of securities that are not rated as
   a matter of policy.
   3. There is a lack of essential data pertaining to the issue or issuer.
   4. The issue was privately  placed, in which case the rating is not published
   in Moody's publications.

Suspension or withdrawal may occur if new and material  circumstances arise, the
effects of which preclude satisfactory analysis; if there is no longer available
reasonable  up-to-date  data to permit a  judgment  to be  formed;  if a bond is
called for redemption; or for other reasons.

NOTE:  Those bonds in the Aa, A, Baa,  Ba and B groups  which  Moody's  believes
possess the strongest  investment  attributes are designated by the symbols Aa1,
A1, Baa1, Ba1 and B1.

                        STANDARD & POOR'S RATINGS GROUP

AAA: Debt rated "AAA" has the highest  rating  assigned by S&P.  Capacity to pay
interest and repay principal is extremely strong.

AA:  Debt  rated  "AA" has a very  strong  capacity  to pay  interest  and repay
principal and differ from the higher rated issues only in small degree.

A: Debt rated "A" has a strong  capacity  to pay  interest  and repay  principal
although it is somewhat more  susceptible  to the adverse  effects of changes in
circumstances and economic conditions than debt in higher rated categories.

BBB: Debt rated "BBB" is regarded as having an adequate capacity to pay interest
and  repay  principal.   Whereas  it  normally  exhibits   adequate   protection
parameters,  adverse  economic  conditions  or changing  circumstances  are more
likely to lead to a weakened  capacity to pay interest and repay  principal  for
debt in this category than in higher rated categories.

BB:  Debt  rated "BB" has less  near-term  vulnerability  to default  than other
speculative issues. However, it faces major ongoing uncertainties or exposure to
adverse  business,  financial,  or  economic  conditions  which  could  lead  to
inadequate  capacity to meet timely  interest and principal  payments.  The "BB"
rating  catgegory  is also used for debt  subordinated  to  senior  debt that is
assigned an actual or implied "BBB-" rating.

B: Debt rated "B" has a greater  vulnerability  to default but currently has the
capacity to meet interest payments and principal  repayments.  Adverse business,
financial,  or economic conditions will likely impair capacity or willingness to
pay interest and repay principal.  The "B" rating category is also used for debt
subordinated  to senior debt that is assigned an actual or implied "BB" or "BB-"
rating.

CCC: Debt rated "CCC" has a currently identifiable vulnerability to default, and
is dependent upon favorable business, financial, and economic conditions to meet
timely  payment of interest and repayment of principal.  In the event of adverse
business,  financial,  or  economic  conditions,  it is not  likely  to have the
capacity to pay interest and repay principal.  The "CCC" rating category is also
used for debt  subordinated to senior debt that is assigned an actual or implied
"B" or "B-" rating.

CC: The rating "CC" is  typically  applied to debt  subordinated  to senior debt
that is assigned an actual or implied "CCC" rating.

C: The rating "C" is typically applied to debt subordinated to senior debt which
is assigned an actual or implied "CCC-" debt rating.  The "C" rating may be used
to cover a  situation  where a  bankruptcy  petition  has been  filed,  but debt
service payments are continued.

CI: The rating "CI" is reserved  for income  bonds on which no interest is being
paid.

D: Bonds rated "D" is in payment  default.  The "D" rating category is used when
interest payments or principal payments are not made on the date due even if the
applicable grace period has not expired,  unless S&P believes that such payments
will be made during such grace period. The "D" rating also will be used upon the
filing of a bankruptcy petition if debt service payment is jeopardized.

PLUS (+) OR MINUS (-):  The  ratings  from "AA" to "CCC" may be  modified by the
addition  of a plus or minus  sign to show  relative  standing  within the major
rating categories.

NR:  Indicates  that  no  public  rating  has  been  requested,  that  there  is
insufficient  information on which to base a rating, or that S&P does not rate a
particular type of obligation as a matter of policy.

                        FITCH INVESTORS SERVICE, INC.

AAA: Bonds  considered to be investment grade and of the highest credit quality.
The  obligor  has an  exceptionally  strong  ability to pay  interest  and repay
principal, which is unlikely to be affected by reasonably foreseeable events.

AA: Bonds considered to be investment grade and of very high credit quality. The
obligor's  ability to pay interest and repay principal is very strong,  although
not quite as strong as bonds rated "AAA".  Because  bonds rated in the "AAA" and
"AA"  categories  are  not   significantly   vulnerable  to  foreseeble   future
developments, short-term debt of these issuers is generally rated "F-1+".

A: Bonds  considered  to be  investment  grade and of high credit  quality.  The
obligor's  ability to pay  interest  and repay  principal  is  considered  to be
strong, but may be more vulnerable to adverse changes in economic conditions and
circumstances than bonds with higher ratings.

BBB: Bonds considered to be investment grade and of satisfactory credit quality.
The  obligor's  ability to pay interest and repay  principal is considered to be
adequate. Adverse changes in economic conditions and circumstances, however, are
more likely to have adverse impact on these bonds,  and therefore  impair timely
payment.  The  likelihood  that the  ratings  of these  bonds  will  fall  below
investment grade is higher than for bonds wih higher ratings.

BB: Bonds are considered speculative.  The obligor's ability to pay interest and
repay principal may be affected over time by adverse economic changes.  However,
business and financial  alternatives  can be  identified  which could assist the
obligor in satisfying its debt service requirements.

B:  Bonds are  considered  highly  speculative.  While  bonds in this  class are
currently meeting debt service requirements, the probability of continued timely
payment of principal  and  interest  reflects the  obligor's  limited  margin of
safety and the need for reasonable business and economic activity throughout the
life of the issue.

CCC: Bonds have certain identifiable characteristics which, if not remedied, may
lead to  default.  The  ability to meet  obligations  requires  an  advantageous
business and economic environment.

CC:  Bonds are  minimally  protected.  Default  in payment  of  interest  and/or
principal seems probable over time.

C: Bonds are in immiment default in payment of interest or principal.

PLUS (+)  MINUS  (-) Plus and  minus  signs  are used  with a rating  symbol  to
indicate the relative position of a credit within the rating category.  Plus and
minus signs, however, are not used in the "AAA" category.

NR Indicates that Fitch does not rate the specific issue.

CONDITIONAL A conditional  rating is premised on the successful  completion of a
project or the occurrence of a specific event.

SUSPENDED  A rating is  suspended  when Fitch  deems the  amount of  information
available from the issuer to be indadequate for rating purposes.

WITHDRAWN  A rating  will be  withdrawn  when an issue  matures  or is called or
refinanced,  and, at Fitch's discretion,  when an issuer fails to furnish proper
and timely information.

FITCHALERT Ratings are placed on FitchAlert to notify investors of an occurrence
that is likely to result in a rating  change  and the likely  direction  of such
change.  These are  designated as  "Positive",  indicating a potential  upgrade,
"Negative", for potential downgrade, or "Evolving",  where ratings may be raised
or lowered.  FitchAlert is relatively short-term,  and should be resolved within
12 months.

                                  APPENDIX C
                         PORTFOLIO COMPOSITION CHART
                    FOR FISCAL YEAR ENDED JANUARY 31, 1994

                                                   PERCENT OF
SECURITY                                           NET ASSETS
- --------                                           ----------
Cash and Cash Equivalents ......................     3%
Debt -- Unrated by S&P .........................    51
DEBT -- S&P RATING
      AAA ......................................    15
      AA  ......................................     7
      A   ......................................    10
      BBB ......................................     9
      BB .......................................     4
      B ........................................     1
                                                   ---
                                                   100%
                                                   ===

    The chart above  indicates the  composition of the Fund's  portfolio for the
Fund's fiscal year ended January 31, 1994, with the debt securities rated by S&P
separated into the indicated  categories.  The  percentages  were  calculated by
averaging the monthly dollar weighted  average of the Fund's net assets invested
in each category.  The chart does not necessarily  indicate what the composition
of the Fund's portfolio will be in subsequent fiscal years.  Rather,  the Fund's
investment objective, policies and restrictions indicate the extent to which the
Fund may purchase securities in the various categories.

<PAGE>
INVESTMENT ADVISER
Massachusetts Financial Services Company
500 Boylston Street, Boston, MA 02116
(617) 954-5000

DISTRIBUTOR
MFS Financial Services, Inc.
500 Boylston Street, Boston, MA 02116
(617) 954-5000

CUSTODIAN AND DIVIDEND DISBURSING AGENT
State Street Bank and Trust Company
225 Franklin Street, Boston, MA 02110

SHAREHOLDER SERVICING AGENT
MFS Service Center, Inc.
500 Boylston Street, Boston, MA 02116
Toll free: (800) 225-2606
MAILING ADDRESS:
P.O. Box 2281, Boston, MA 02107-9906

INDEPENDENT ACCOUNTANTS
Ernst & Young
200 Clarendon Street, Boston, MA 02116


                               MFS(R) MUNICIPAL
                               HIGH INCOME FUND
                   500 Boylston Street, Boston, Mass. 02116

                                                     MMH-1-6/94/118M    25/225

                                    MFS(R)
                                  MUNICIPAL
                                 HIGH INCOME
                                     FUND



                                  PROSPECTUS
                                 June 1, 1994





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