EXHIBIT 23.1
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We consent to the use in this Registration Statement on Form S-1 of our report dated July 31, 2007 relating to the consolidated financial statements of MSCI Inc., appearing in the Prospectus, which is part of this Registration Statement.
We also consent to the reference to us under the heading “Experts” in such Prospectus.
/s/ Deloitte & Touche LLP
New York, New York
July 31, 2007