EXHIBIT 4.1
INTERACTIVE DATA
FINANCIAL TIMES Information
100 William Street, 15th Floor
New York, NY 10038
USA Tel: (212) 269-6300
Fax: (212) 771-6445
December 12, 2000
Van Kampen Funds Inc.
One Parkview Plaza
Oakbrook Terrace, IL 60181
Re: Van Kampen Focus Portfolios, Series 266
Opportunity Portfolio I
(A Unit Investment Trust) Registered Under the Securities Act
of 1933, File No. 333-51630
Gentlemen:
We have examined the Registration Statement for the above captioned
Fund, a copy of which is attached hereto.
We hereby consent to the reference in the Prospectus and Registration
Statement for the above captioned Fund to Interactive Data Corporation, as the
Evaluator, and to the use of the Obligations prepared by us which are referred
to in such Prospectus and Statement.
You are authorized to file copies of this letter with the Securities
and Exchange Commission.
Very truly yours,
Steve Miano
Director Fixed Income Data Operations
