EXHIBIT 23-a INDEPENDENT AUDITORS' CONSENT We consent to the incorporation by reference in this Registration Statement of Morgan Stanley (the "Registrant") on Form S-3 dated July 3, 2003 of our reports dated January 10, 2003, appearing in the Annual Report on Form 10-K of the Registrant for the fiscal year ended November 30, 2002, and to the reference to us under the heading "Experts" in each Prospectus, which is part of this Registration Statement. /s/ Deloitte & Touche LLP New York, New York July 3, 2003