DETROIT/March 8, 2004 - Comerica Incorporated (NYSE: CMA) will host an Investor Day on Thursday, March 11, 2004, at The St. Regis, located at Two East 55th Street at Fifth Avenue in New York City. Presentations will begin at 8 a.m. and conclude at 12:30 p.m.

Presenters will include Ralph W. Babb Jr., chairman, president and chief executive officer, and other members of the Comerica management team.

Members of the professional investment community are invited to attend the event.

The general public is invited to participate via a live Webcast, which will be available at http://www.comerica.com/2004investorday. The Investor Day agenda and presentation materials also will be available at the site.

The audio portion of the presentations may be accessed by calling (800) 810-0924 (domestic) or (913) 981-4900 (international). Audio and Webcast replays will be available approximately four hours following the event through June 9, 2004. Audio replays may be accessed at (888) 203-1112 (domestic) or (719) 457-0820 (international, not a toll-free call). The replay passcode is 313884. Webcast replays may be accessed at http://www.comerica.com/2004investorday.

Comerica Incorporated is a financial services company headquartered in Detroit, strategically aligned into the Business Bank, Small Business & Personal Financial Services, and Wealth & Institutional Management. Comerica focuses on relationships, and helping businesses and people be successful. Comerica reported total assets of $53 billion at December 31, 2003.