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<TYPE>EX-99.77D POLICIES
<SEQUENCE>2
<FILENAME>d77.txt
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                                  SUB-ITEM 77D

The Board of Trustees of MFS High Yield  Municipal  Trust (CMU) has  approved
changes to the investment objective and policies of the fund. Effective December
21, 2007, CMUs investment objective of seeking to provide high current income
generally exempt from federal  income taxes with a secondary  objective to seek
total  return was revised to provide  that CMU will seek high  current  income
exempt from federal  income tax, but may also  consider  capital  appreciation.
Significant changes to CMUs  principal  investment  strategies  are  described
below.

The investment strategy stating the fund may invest in securities rated C only
if the advisor  believes the quality is better than the rating  agency has been
eliminated.

The principal  investment  strategy of typically  investing in securities rated
BBB/Baa  and lower has been eliminated and the funds  principal  investment
strategy  states, MFS may  invest  up to 100% of the  funds  assets  in lower
quality debt instruments, including those that are in default.

The percentage  limitation of investing 80% in debt securities  consistent with
the  investment  objectives  of high  current income and total  return has been
eliminated  to provide  the  portfolio  manager more flexibility  to invest in
appropriate securities.

The percentage  limitation of investing less than 25% in industrial development
bonds has been eliminated and the principal  investment  strategy  states, MFS
may invest 25% or more of the fund's total assets in municipal instruments that
finance  similar  projects,  such as those  relating to education,  healthcare,
housing, utilities, water, or sewer.

The  percentage  limitation  of  investing  less  than  20% in  short-term U.S.
government securities, repurchase agreements, or highly rated short-term notes
if suitable  short-term  municipal instruments not available and the investment
strategy  stating the fund may invest less than 20%for temporary purposes have
each been eliminated and the funds principal investment strategy states that in
response to market, economic, political,  or other conditions, MFS may depart
from the fund's  principal investment strategies by temporarily  investing for
defensive purposes.
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