MFS SERIES TRUST I
497, 1998-06-24
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<PAGE>
                             MFS EQUITY INCOME FUND

             Supplement to the Prospectus and Statement of Additional
                         Information dated January 1, 1998.


     The following  information  should be read in  conjunction  with the Fund's
Prospectus  and Statement of Additional  Information  ("SAI"),  dated January 1,
1998, and contains a description of Class I shares.

     Class I shares are  available  for  purchase  only by certain  investors as
described under the caption "Eligible Purchasers" below.

EXPENSE SUMMARY
<TABLE>
<S>                                                                                              <C>

Shareholder Transaction Expenses:                                                                Class I
   Maximum Initial Sales Charge Imposed on Purchases of Fund
     Shares (as a percentage of offering price)...........................................       None
   Maximum Contingent Deferred Sales Charge (as a percentage
     of original purchase price or redemption proceeds, as applicable)....................       None

Annual Operating Expenses of the Fund (as a percentage of average net assets):
   Management Fees........................................................................       0.60%
   Rule 12b-1 Fees........................................................................       None
   Other Expenses (after expense limitation)(1)(2)........................................       0.40%
                                                                                                 ----
   Total Operating Expenses (after expense limitation)(2).................................       1.00%
</TABLE>

 .........................
 (1) The Fund  has an  expense  offset  arrangement  which  reduces  the  Fund's
     custodian fee based upon the amount of cash maintained by the Fund with its
     custodian  and  dividend  disbursing  agent,  and may enter into other such
     arrangements and directed brokerage arrangements (which would also have the
     effect of reducing the Fund's  expenses).  Any such fee  reductions are not
     reflected under "Other Expenses."
(2)  The   Adviser  has  agreed  to  bear  the  Fund's   expenses,   subject  to
     reimbursement  by the Fund, such that "Other  Expenses" do not exceed 0.40%
     per annum of its average daily net assets  during the current  fiscal year.
     Otherwise,  "Other Expenses" and "Total Operating  Expenses" would be 2.15%
     and 2.75%, respectively. See "Other Information" below.

                               Example of Expenses

     An investor would pay the following  dollar amounts of expenses on a $1,000
investment  in Class I shares of the Fund,  assuming (a) a 5% annual  return and
(b) redemption at the end of each of the time periods indicated:

              Period                             Class I
              1 year......................         $10
              3 years.....................          32

     The  purpose  of  the  expense  table  above  is  to  assist  investors  in
understanding the various costs and expenses that a shareholder of the Fund will
bear  directly  or  indirectly.  A  more  complete  description  of  the  Fund's
management  fee is set forth under the caption  "Management  of the Fund" in the
Prospectus.

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.

<PAGE>


CONDENSED FINANCIAL INFORMATION

     The  following   information  has  been  audited  and  should  be  read  in
conjunction with the financial  statements  included in the Fund's Annual Report
to  Shareholders  which are  incorporated  by reference into the SAI in reliance
upon the report of the Fund's independent  auditors,  given upon their authority
as experts in accounting and auditing. The Fund's independent auditors are Ernst
& Young LLP.

Financial Highlights - Class I Shares

<TABLE>
<S>                                                                                      <C>
                                                                                         PERIOD ENDED
                                                                                        AUGUST 31, 1997*

Per share data (for a share outstanding throughout the period):
Net asset value - beginning of period                                                        $12.20
Income from investment operations# -
     Net investment incomess.                                                               $  0.15
     Net realized and unrealized gain on investments
         and foreign currency transactions                                                     2.46
                                                                                             ------
              Total from investment operations                                              $  2.61
                                                                                            -------
Net asset value - end of period                                                              $14.81
                                                                                             ------
Total return                                                                                  21.39%++
Ratios (to average net assets)/Supplemental datass.:
     Expenses                                                                                  1.50%+
     Net investment income                                                                     1.51%+
Portfolio turnover                                                                              118%
Average commission rate                                                                      $ 0.0393
Net assets at end of period (000 omitted)                                                    $    964
</TABLE>

- --------------------------
*    For the period from the inception of Class I, January 2, 1997, through 
     August 31, 1997.
+    Annualized.
++   Not annualized.
#    Per share data are based on average shares outstanding.
##   The Fund's expenses are calculated without reduction for fees paid 
     indirectly.
ss.  The Adviser  voluntarily  agreed to maintain the expenses of the Fund at
     not  more  than  1.50% of the  Fund's  average  daily  net  assets.  The
     investment adviser,  distributor and shareholder servicing agent did not
     impose any of their fees for the period indicated. If these fees had not
     been waived by the Fund and/or if actual  expenses  had been  over/under
     this  limitation,  the net  investment  income  per share and the ratios
     would have been:
<TABLE>
     <S>                                                                                      <C>

     Net investment income $0.03 Ratios (to average net assets):
         Expenses##                                                                            2.67%+
         Net investment income                                                                 0.35%+
</TABLE>

ELIGIBLE PURCHASERS

Class I shares are  available  for  purchase  only by the  following  purchasers
("Eligible Purchasers"):

(i)  certain  retirement  plans  established  for the  benefit of  employees  of
     Massachusetts  Financial  Services Company ("MFS"),  the Fund's  investment
     adviser, and employees of MFS' affiliates;
<PAGE>

(ii) any fund distributed by MFS Fund  Distributors,  Inc.  ("MFD"),  the Fund's
     distributor,  if the fund  seeks to achieve  its  investment  objective  by
     investing  primarily in shares of the Fund and other funds  distributed  by
     MFD;

(iii)any retirement  plan,  endowment or foundation  which (a) purchases  shares
     directly through MFD (rather than through a third party broker or dealer or
     other financial intermediary);  (b) has, at the time of purchase of Class I
     shares, aggregate assets of at least $100 million; and (c) invests at least
     $10  million in Class I shares of the Fund either  alone or in  combination
     with  investments  in Class I shares of other MFS funds  distributed by MFD
     (additional  investments may be made in any amount);  provided that MFD may
     accept  purchases  from smaller  plans,  endowments  or  foundations  or in
     smaller amounts if it believes, in its sole discretion,  that such entity's
     aggregate  assets  will equal or exceed $100  million,  or that such entity
     will make additional  investments  which will cause its total investment to
     equal or exceed $10 million, within a reasonable period of time; and

(iv) bank trust  departments or law firms acting as trustee or manager for trust
     accounts which initially invest, on behalf of their trust clients, at least
     $100,000 in Class I shares of the Fund (additional  investments may be made
     in any amount);  provided that MFD may accept smaller initial  purchases if
     it believes, in its sole discretion,  that the bank trust department or law
     firm  will make  additional  investments,  on behalf of its trust  clients,
     which will cause its total  investment to equal or exceed $100,000 within a
     reasonable period of time.

In no event will the Fund,  MFS,  MFD or any of their  affiliates  pay any sales
commissions or  compensation  to any third party in connection  with the sale of
Class I shares; the payment of any such sales commission or compensation  would,
under the Fund's policies,  disqualify the purchaser as an eligible  investor in
Class I shares.

SHARE CLASSES OFFERED BY THE FUND

     Four classes of shares of the Fund currently are offered for sale,  Class A
shares,  Class B shares,  Class C shares and Class I shares.  Class I shares are
available for purchase only by Eligible  Purchasers,  as defined above,  and are
described in this Supplement.  Class A shares, Class B shares and Class C shares
are  described in the Fund's  Prospectus  and are  available for purchase by the
general public.

     Class A shares are offered at net asset value plus an initial  sales charge
up to a maximum of 5.75% of the offering  price (or a contingent  deferred sales
charge (a "CDSC") of 1.00% upon redemption  during the first year in the case of
purchases of $1 million or more and certain purchases by retirement  plans), and
are  subject to an annual  distribution  fee and  service fee up to a maximum of
0.35% per  annum.  Class B shares  are  offered  at net asset  value  without an
initial sales charge but are subject to a CDSC upon  redemption  (declining from
4.00%  during the first  year to 0% after six years) and an annual  distribution
fee and service fee up to a maximum of 1.00% per annum;  Class B shares  convert
to Class A shares  approximately eight years after purchase.  Class C shares are
offered at net asset value  without an initial sales charge but are subject to a
1.00% CDSC upon redemption during the first year and an annual  distribution fee
and service  fee up to a maximum of 1.00% per annum.  Class I shares are offered
at net asset value  without an initial  sales charge or CDSC and are not subject
to a  distribution  or  service  fee.  Class C shares  and Class I shares do not
convert to any other class of shares of the Fund.

OTHER INFORMATION

     Eligible  Purchasers may purchase Class I shares only directly through MFD.
Eligible  Purchasers  may exchange Class I shares of the Fund for Class I shares
of any other MFS Fund  available  for purchase by such  Eligible  Purchasers  at
their net asset value (if available for sale),  and may exchange  Class I shares
of the Fund for shares of the MFS Money Market Fund (if available for sale), and
may redeem Class I shares of the Fund at net asset value.  Distributions paid by
the Fund with  respect to Class I shares  generally  will be greater  than those
paid with respect to Class A shares,  Class B shares and Class C shares  because
expenses  attributable  to Class A  shares,  Class B shares  and  Class C shares
generally will be higher.
<PAGE>

     Subject to termination  or revision at the sole  discretion of MFS, MFS has
agreed to bear the Fund's expenses such that the Fund's "Other  Expenses," which
are defined to include all Fund expenses except for management fees, Rule 12-b-1
fees, taxes, extraordinary expenses,  brokerage and transactions costs and class
specific expenses, do not exceed 0.40% per annum of its average daily net assets
(the  "Maximum  Percentage").  The  obligation  of MFS to  bear  these  expenses
terminates  on the last day of the Fund's fiscal year in which the Fund's "Other
Expenses" are less than or equal to the Maximum Percentage. The payments made by
MFS on behalf of the Fund under this arrangement are subject to reimbursement by
the  Fund to MFS,  which  will be  accomplished  by the  payment  of an  expense
reimbursement  fee by the Fund to MFS  computed and paid monthly at a percentage
of its  average  daily net  assets  for its then  current  fiscal  year,  with a
limitation that immediately  after such payment the Fund's "Other Expenses" will
not exceed the Maximum Percentage. This expense reimbursement by the Fund to MFS
terminates  on the earlier of the date on which  payments made by the Fund equal
the prior payment of such reimbursable expenses by MFS or August 31, 2006.

                  The date of this Supplement is June 24, 1998




<PAGE>
                             MFS EQUITY INCOME FUND

                  Supplement to the January 1, 1998 Prospectus

         This Supplement  describes  certain changes to the Fund's Prospectus to
reflect a management fee reduction as follows:

1.       EXPENSE SUMMARY

<TABLE>
<S>                                                                                   <C>         <C>           <C>

Shareholder Transaction Expenses:                                                     Class A     Class B       Class C

     Maximum Initial Sales Charge Imposed on Purchases
       of Fund Shares (as a percentage of offering price).........................     5.75%          0.00%       0.00%
     Maximum Contingent Deferred Sales Charge (as a percentage
       of original purchase price or redemption proceeds,
       as applicable).............................................................   See Below(1)     4.00%       1.00%
</TABLE>
<TABLE>
<S>                                                                                    <C>            <C>         <C>

Annual  Operating  Expenses of the Fund (as a  percentage  of average  daily net
assets):

     Management Fees(2)...........................................................     0.60%          0.60%       0.60%
     Rule 12b-1 Fees..............................................................     0.35%(3)       1.00%(4)    1.00%(4)
     Other Expenses (after expense limitation)(5) (6).............................     0.40%          0.40%       0.40%
                                                                                       -----          -----       -----
     Total Operating Expenses (after expense limitation)(6).......................     1.35%          2.00%       2.00%
</TABLE>

- -----------------------------
(1)  Purchases of $1 million or more and certain  purchases by retirement  plans
     are not subject to an initial sales charge;  however, a contingent deferred
     sales  charge (a "CDSC") of 1% will be  imposed  on such  purchases  in the
     event of certain  redemption  transactions  within 12 months following such
     purchases  (see  "Information  Concerning  Shares of the Fund -  Purchases"
     below).
(2)  Effective  July 1, 1998, the management fee is reduced from 0.75% per annum
     of the  Fund's  average  daily net  assets to 0.60% per annum of the Fund's
     average daily net assets.
(3)  The Fund has adopted a distribution  plan for its shares in accordance with
     Rule 12b-1 under the Investment  Company Act of 1940, as amended (the "1940
     Act")  (the  "Distribution   Plan"),   which  provides  that  it  will  pay
     distribution/service  fees  aggregating up to (but not  necessarily all of)
     0.35% per annum of the  average  daily net assets  attributable  to Class A
     shares.  Distribution  expenses  paid under this  Plan,  together  with the
     initial sales charge, may cause long-term shareholders to pay more than the
     maximum sales charge that would have been  permissible if imposed  entirely
     as an initial sales charge (see "Information  Concerning Shares of the Fund
     - Distribution Plan" below).
(4)  The Fund's Distribution Plan provides that it will pay distribution/service
     fees  aggregating up to (but not necessarily all of) 1.00% per annum of the
     average  net  assets  attributable  to  Class B shares  and  Class C shares
     respectively.  Distribution  expenses paid under the Distribution Plan with
     respect to Class B or Class C shares,  together  with any CDSC payable upon
     redemption of Class B and Class C shares, may cause long-term  shareholders
     to pay more than the maximum sales charge that would have been  permissible
     if imposed entirely as an initial sales charge (see "Information Concerning
     Shares of the Fund - Distribution Plan" below).
(5)  The Fund  has an  expense  offset  arrangement  which  reduces  the  Fund's
     custodian fee based upon the amount of cash maintained by the Fund with its
     custodian  and  dividend  disbursing  agent,  and may enter into other such
     arrangements and directed brokerage arrangements (which would also have the
     effect of reducing the Fund's  expenses).  Any such fee  reductions are not
     reflected under "Other Expenses."
(6)  The   Adviser  has  agreed  to  bear  the  Fund's   expenses,   subject  to
     reimbursement  by the Fund, such that "Other  Expenses" do not exceed 0.40%
     per annum of the Fund's  average daily net assets during the current fiscal
     year. Otherwise,  "Other Expenses" for each of Class A, Class B and Class C
     shares would be 2.15% per annum, and "Total  Operating  Expenses" for Class
     A, Class B and Class C shares would be 3.10%, 3.75% and 3.75%, respectively
     (see "Information Concerning Shares of the Fund - Expenses" below).

<PAGE>

                               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              Class C
                                                      (1)                 (1)
    1 year..............       $ 70        $ 60      $ 20       $ 30    $ 20
    3 years.............         98          93        63         63      63
    5 years.............        127         128       108        108     108
   10 years.............        211         216(2)    216(2)     233     233
- -----------------------------
(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  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 Fund
expenses are set forth in the following sections in the Prospectus:  (i) varying
sales charges on share purchases - "Information  Concerning Shares of the Fund -
Purchases";  (ii) varying CDSCs - "Information  Concerning  Shares of the Fund -
Purchases";  (iii)  management  fees  -  "Management  of the  Fund -  Investment
Adviser";  and (iv) Rule  12b-1  (i.e.,  distribution  plan)  fees  "Information
Concerning Shares of the Fund - 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.

2.       MANAGEMENT OF THE FUND - Investment Adviser

         Effective  as of July 1,  1998,  the last two  sentences  of the  first
paragraph in the section entitled  "Management of the Fund - Investment Adviser"
on Page 20 of the  Prospectus  are hereby deleted and replaced in their entirety
as follows:

         "For its  services  and  facilities,  the  Adviser  receives  an annual
         management fee, computed and paid monthly,  in an amount equal to 0.60%
         of the Fund's average daily net assets.

                  The date of this Supplement is June 24, 1998.



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