UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  SCHEDULE 14A

                PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE
                         SECURITIES EXCHANGE ACT OF 1934
                                (AMENDMENT NO. )


Filed by the Registrant [X]    Filed by a Party Other Than the Registrant [ ]

Check the Appropriate Box:

[ ] Preliminary Proxy Statement
[ ] Confidential for Use of the Commission Only (as permitted by Rule
    14a-6(e)(2))
[ ] Definitive Proxy Statement
[X] Definitive Additional Materials
[ ] Soliciting Material Pursuant to sec. 240.14a-11(c) of sec. 240.14a-12

                               MFS SERIES TRUST I
                               MFS SERIES TRUST II
                              MFS SERIES TRUST III
                               MFS SERIES TRUST IV
                               MFS SERIES TRUST V
                               MFS SERIES TRUST VI
                              MFS SERIES TRUST VIII
                               MFS SERIES TRUST IX
                               MFS SERIES TRUST X
                               MFS SERIES TRUST XI
                              MFS SERIES TRUST XII
                              MFS SERIES TRUST XIII
                    MASSACHUSETTS INVESTORS GROWTH STOCK FUND
                          MASSACHUSETTS INVESTORS TRUST

             (Names of Registrants as Specified in their Charters)

    (Name of Person(s) Filing Proxy Statement, if other than the Registrants)

Payment of Filing Fee (Check the Appropropriate Box):

[X] No fee required
[ ] Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and 0-11.

1)       Title of each class of securities to which transaction applies:
2)       Aggregate number of securities to which transaction applies:


3)       Per unit price or other underlying value of transaction computed
         pursuant to Exchange Act Rule 0-11 (Set forth the amount on which the
         filing fee is calculated and state how it was determined):
4)       Proposed maximum aggregate value of transaction: 5) Total Fee Paid:

[ ] Fee paid previously with preliminary materials.

[ ] Check box if any part of the fee is offset as provided by Exchange Act
    Rule 0-11(a)(2) and identify the filing for which the offsetting fee was
    paid previously. Identify the previous filing by registration statement
    number, or the Form or Schedule and the date of its filing.

1) Amount previously paid:
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4) Date Filed:


                                   [MFS LOGO]
Recently we sent you proxy materials regarding the Special Meeting of Class R1
Shareholders of the MFS Funds referenced on the reverse page (each a "Fund").
Our records indicate that we have not received your important vote. We urge you
to act promptly in order to allow us to obtain a sufficient number of votes to
hold the Meeting and avoid the possibility of an adjournment.

                                EVERY VOTE COUNTS
You may think your vote is not important, but your participation is critical to
hold the meeting, so please vote immediately. Any additional solicitations are
costly and time-consuming. We urge you to vote your proxy now. You and all other
shareholders will benefit from your cooperation.

EACH FUND'S BOARD OF TRUSTEES UNANIMOUSLY RECOMMENDS THAT YOU VOTE IN FAVOR OF
THE PROPOSAL AND BELIEVES THE PROPOSAL IS IN THE BEST INTEREST OF EACH FUND'S
SHAREHOLDERS.
                                 1-866-414-6353




Please vote now to be sure your vote is received  in time for the  February  15,
2008 Special Meeting of Shareholders. Thank you for your participation.



MFS has made it very easy for you to vote. Choose one of the following methods:

o    Speak to a Proxy  Specialist by calling the number above. We can answer any
     of your proxy related  questions and record your vote.  (Open: M-F 9:30am -
     9pm, Sat 10am - 6pm ET)

o    Log on to the website  noted on your proxy card,  enter the control  number
     printed on the card, and vote by following the on-screen prompts.

o    Dial the toll-free phone number on the proxy card, enter the control number
     printed on the card and follow the touchtone prompts.

o    Mail in your signed proxy card in the envelope provided.

                        Voting takes only a few minutes.
                               PLEASE VOTE TODAY.
           (If you have recently voted, please disregard this notice.)



MFS Series Trust I (File Nos. 33-7638 and 811-4777)
- ------------------
MFS Cash Reserve Fund
MFS Core Equity Fund
MFS Core Growth Fund
MFS New Discovery Fund
MFS Research International Fund
MFS Technology Fund
MFS Value Fund

MFS Series Trust II (File Nos. 33-7637 and 811-4775)
- -------------------
MFS Emerging Growth Fund

MFS Series Trust III (File Nos. 2-60491 and 811-2794)
- --------------------
MFS High Income Fund

MFS Series Trust IV (File Nos. 2-54607 and 811-2594)
- -------------------
MFS Mid Cap Growth Fund

MFS Series Trust V (File Nos. 2-38613 and 811-2031)
- ------------------
MFS International New Discovery Fund
MFS Research Fund
MFS Total Return Fund

MFS Series Trust VI (File Nos. 33-34502 and 811-6102)
- -------------------
MFS Global Equity Fund
MFS Global Total Return Fund
MFS Utilities Fund

MFS Series Trust VIII (File Nos. 33-37972 and 811-5262)
- ---------------------
MFS Global Growth Fund

MFS Series Trust IX (File Nos. 2-50409 and 811-2464)
- -------------------
MFS Bond Fund
MFS Inflation-Adjusted Bond Fund
MFS Limited Maturity Fund
MFS Research Bond Fund

MFS Series Trust X (File Nos. 33-1657 and 811-4492)
- ------------------
MFS Aggressive Growth Allocation Fund
MFS Conservative Allocation Fund
MFS Growth Allocation Fund
MFS International Diversification Fund
MFS Moderate Allocation Fund
MFS New Endeavor Fund
MFS Strategic Value Fund

MFS Series Trust XI (File Nos. 33-68310 and 811-7992)
- -------------------
MFS Mid Cap Value Fund

MFS Series Trust XII (File Nos. 333-126328 and 811-21780)
- ------------------
MFS Lifetime Retirement Income Fund
MFS Lifetime 2010 Fund
MFS Lifetime 2020 Fund
MFS Lifetime 2030 Fund
MFS Lifetime 2040 Fund

MFS Series Trust XIII (File Nos. 2-74959 and 811-3327)
- ---------------------
MFS Government Securities Fund

Massachusetts Investors Growth Stock Fund (File Nos. 2-14677 and 811-00859)

Massachusetts Investors Trust (File Nos. 2-11401 and 811-00203)
                                                                          MFSFED