CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

     We have issued our report dated April 22, 2008, accompanying the financial
statements of Insured Municipals Income Trust, Series 497 and Ohio Insured
Municipals Income Trust, Series 135 (included in Van Kampen Unit Trusts,
Municipal Series 544) as of December 31, 2007, and for each of the three years
in the period then ended and the financial highlights for the period from
January 19, 2005 (date of deposit) through December 31, 2005 and for each of the
two years in the period ended December 31, 2007, contained in this
Post-Effective Amendment No. 3 to Form S-6 (File No. 333-120826) and Prospectus.

     We hereby consent to the use of the aforementioned report in this
Post-Effective Amendment and Prospectus and to the use of our name as it appears
under the caption "Other Matters-Independent Registered Public Accounting Firm".

                                                  GRANT THORNTON LLP

New York, New York
April 22, 2008