<DOCUMENT>
<TYPE>EX-99.77K CHNG ACCNT
<SEQUENCE>6
<FILENAME>k77.txt
<TEXT>
July 27, 2007

Securities and Exchange Commission
100 F Street, N.E.
Washington, DC 20549

Commissioners:

We have read the statements  made by MFS High Yield Municipal Trust (the Fund,
formerly known as Colonial  Municipal  Income Trust) (copy  attached),  which we
understand will be filed with the Securities and Exchange  Commission,  pursuant
to Item 77K of Form  N-SAR,  as part of the  Funds  Form  N-SAR  report for the
period  ended  May  31,  2007.  We agree  with the
statements concerning our Firm in such Form N-SAR.

Very truly yours,



PricewaterhouseCoopers LLP

On June   29,  2007,  PricewaterhouseCoopers  LLP
(PwC) resigned as the independent  registered  public  accounting firm for the
Trust. During the two most recent fiscal years, PwCs audit reports contained no
adverse  opinion or  disclaimer  of opinion;  nor were its reports  qualified or
modified as to uncertainty,  audit scope, or accounting principles.  Further, in
connection  with its audits for the two most  recent  fiscal  years and  through
June 29, 2007, there were no disagreements between
the Trust and PwC on any matter of accounting principles or practices, financial
statement  disclosure or auditing scope or procedure,  which, if not resolved to
the  satisfaction  of PwC, would have caused it to make reference to the subject
matter of the  disagreement  in its report on the financial  statements for such
years. Effective June 29, 2007, Ernst & Young LLP
was appointed by the audit committee of the Board of Trustees as the independent
registered  public  accounting  firm of the  Trust  for the  fiscal  year  ended
November 30, 2007.
</TEXT>
</DOCUMENT>
