We
consent to the incorporation by reference of our report dated March 13,
2007, relating to the consolidated financial statements of BlackRock, Inc.
appearing in the Annual Report on Form 10-K of BlackRock, Inc. for the year
ended December 31, 2006, which is incorporated by reference in
Post-Effective Amendment No. 4 to Registration Statement No. 333-132911 on Form
S-3 of Merrill Lynch and Co., Inc. and subsidiaries.