Micromuse Inc. (Nasdaq:MUSE), the leading provider of business and service assurance software, today announced the appointment of Lloyd Carney as Chairman of the Board and Chief Executive Officer, effective immediately. Mr. Carney will be based at Micromuse’s global headquarters in San Francisco, Calif. Mike Luetkemeyer, who has served as Interim CEO since Jan. 1, 2003, will continue in his role as Chief Financial Officer and as a member of the Micromuse Board of Directors.