INSURED MUNICIPALS INCOME TRUST & IN QU TAX EX TR MUL SE 323, 497J, 1999-10-04

INSURED MUNICIPALS INCOME TRUST & IN QU TAX EX TR MUL SE 323
497J, 1999-10-04

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                                 October 4, 1999



Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, D.C. 20549-1004
Attn:  Filing Desk, Stop 1-4


Re:  Van Kampen Focus Portfolios, Municipal Series 323 (File No. 333-83357) (CIK
     No. 1024849)
     ---------------------------------------------------------------------------

Gentlemen:

         In accordance with the provisions of Rule 497(j) of Regulation C under
the Securities Act of 1933 (the "Securities Act") this letter serves to certify
that the most recent amendment to the registration statement of Form S-6 for the
above captioned Trust does not differ from that which would have been filed
pursuant to Rule 497(b) of the Securities Act. Amendment No. 1 to the
registration statement, which was the most recent amendment to the registration
statement, was filed electronically with the Commission on September 30, 1999.


                                                               Very truly yours,

                                                           VAN KAMPEN FUNDS INC.