<DOCUMENT>
<TYPE>EX-99.77B ACCT LTTR
<SEQUENCE>6
<FILENAME>b77.txt
<TEXT>



Report of Ernst & Young LLP, Independent Registered Public Accounting Firm

To the Shareholders and Board of Trustees of
MFS Investment Grade Municipal Trust

In planning and performing our audit of the financial  statements of MFS
 Investment  Grade Municipal Trust (the Fund) as of and for the
year ended  datelstransMonth11Day30Year2007November  30,  2007,  in
accordance  with the  standards of the Public  Company  Accounting
Oversight  Board (United  States),  we  considered  the Funds  internal
  control over  financial  reporting,  including  controls over
safeguarding  securities,  as a basis for designing our auditing
procedures for the purpose of expressing our opinion on the financial
statements and to comply with the  requirements  of Form N-SAR,
but not for the purpose of expressing an opinion on the  effectiveness
of the Funds internal control over financial reporting. Accordingly,
 we express no such opinion.

The management of the Fund is responsible for establishing and maintaining
  effective  internal  control over financial  reporting.  In
fulfilling this  responsibility,  estimates and judgments by management
 are required to assess the expected  benefits and related costs
of controls.  A companys  internal control over financial  reporting is
a process designed to provide reasonable  assurance  regarding
the reliability of financial  reporting and the preparation of financial
  statements for external purposes in accordance with generally
accepted accounting  principles.  A companys internal control over
financial reporting includes those policies and procedures that (1)
pertain to the maintenance of records that, in reasonable  detail,
accurately and fairly reflect the  transactions and dispositions of
the assets of the company;  (2) provide  reasonable  assurance  that
  transactions  are recorded as necessary to permit  preparation of
financial  statements in accordance with generally accepted  accounting
 principles,  and that receipts and expenditures of the company
are being made only in  accordance  with  authorizations  of  management
  and  directors  of the  company;  and (3) provide  reasonable
assurance  regarding  prevention or timely detection of unauthorized
  acquisition,  use or disposition of a companys assets that could
have a material effect on the financial statements.


Because of its  inherent  limitations,  internal  control  over  financial
  reporting  may not prevent or detect  misstatements.  Also,
projections of any evaluation of  effectiveness to future periods are
subject to the risk that controls may become  inadequate  because
of changes in conditions, or that the degree of compliance with the
policies or procedures may deteriorate.


A deficiency in internal  control over financial  reporting
 exists when the design or operation of a control does not allow
management
or employees,  in the normal course of performing  their assigned
  functions,  to prevent or detect  misstatements on a timely basis. A
material weakness is a deficiency,  or a combination of deficiencies,
 in internal control over financial reporting, such that there is
a reasonable  possibility that a material  misstatement of the company
s annual or interim  financial  statements will not be prevented
or detected on a timely basis.


Our  consideration  of the Funds  internal  control  over  financial
  reporting  was for the limited  purpose  described  in the first
paragraph and would not necessarily  disclose all  deficiencies in internal
  control that might be material  weaknesses under standards
established by the Public Company Accounting Oversight Board
(country-regionplaceUnited  States). However, we noted no deficiencies in
the Funds internal  control over financial  reporting and its operation,
 including  controls over  safeguarding  securities,  that we
consider to be a material weakness as defined above as of datelstrans
Month11Day30Year2007November 30, 2007.

This report is intended solely for the  information  and use of
management and the Board of Trustees of MFS Investment  Grade Municipal
Trust and the  Securities  and  Exchange  Commission  and is not
intended  to be and  should  not be used by anyone  other  than these
specified parties.



        Ernst & Young LLP

Boston, Massachusetts
datelstransMonth1Day16Year2008January 16, 2008


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