EX-99.CERT-A1 2 file002.htm CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER

                                                                    EXHIBIT 3 A1

                  CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER

I, Ronald E. Robison, certify that:

1.       I have reviewed this report on Form N-Q of Morgan Stanley Insured
         Municipal Income Trust;

2.       Based on my knowledge, this report does not contain any untrue
         statement of a material fact or omit to state a material fact necessary
         to make the statements made, in light of the circumstances under which
         such statements were made, not misleading with respect to the period
         covered by this report;

3.       Based on my knowledge, the schedules of investments included in this
         report fairly present in all material respects the investments of the
         registrant as of the end of the fiscal quarter for which the report is
         filed;

4.       The registrant's other certifying officer(s) and I are responsible for
         establishing and maintaining disclosure controls and procedures (as
         defined in Rule 30a-3(c) under the Investment Company Act of 1940) for
         the registrant and have:

         (a)  Designed such disclosure controls and procedures, or caused such
              disclosure controls and procedures to be designed under our
              supervision, to ensure that material information relating to the
              registrant, including its consolidated subsidiaries, is made known
              to us by others within those entities, particularly during the
              period in which this report is being prepared;

         (b)  Omitted;

         (c)  Evaluated the effectiveness of the registrant's disclosure
              controls and procedures and presented in this report our
              conclusions about the effectiveness of the disclosure controls and
              procedures, as of a date within 90 days prior to the filing date
              of this report, based on such evaluation; and

         (d)  Disclosed in this report any change in the registrant's internal
              control over financial reporting that occurred during the
              registrant's most recent fiscal quarter that has materially
              affected, or is reasonably likely to materially affect, the
              registrant's internal control over financial reporting; and

5.       The registrant's other certifying officer(s) and I have disclosed to
         the registrant's auditors and the audit committee of the registrant's
         board of directors (or persons performing the equivalent functions):

         (a)  All significant deficiencies and material weaknesses in the design
              or operation of internal control over financial reporting which
              are reasonably likely to adversely affect the registrant's ability
              to record, process, summarize, and report financial information;
              and

         (b)  Any fraud, whether or not material, that involves management or
              other employees who have a significant role in the registrant's
              internal control over financial reporting.



Date: September 20, 2004

                                                     /s/ Ronald E. Robison
                                                     Ronald E. Robison
                                                     Principal Executive Officer