MASSACHUSETTS FINANCIAL SERVICES COMPANY
                          500 Boylston Street, Boston, Massachusetts 02116-3741
                                 617 - 954-5000




                                        March 16, 2007

VIA EDGAR
United States Securities & Exchange Commission
100 F Street, N.E.
Washington, DC  20549

     Re:  Withdrawal  of Form RW EDGAR Filing Filed on March 15, 2007 and tagged
          with 1933 Act reference: 002-92915

Ladies and Gentlemen:

     Please  withdraw  the MFS  Municipal  Series  Trust Form RW filing that was
filed on March 15, 2007, with accession number 0000912938-07-000226.

     The March 15, 2007 filing incorrectly  referenced the 1933 reference number
002-92915 when in fact it should have referenced File No. 333-141302.

                                        Sincerely,



                                        BRIAN E. LANGENFELD
                                        Brian E. Langenfeld
                                        Counsel