SAN FRANCISCO -- Micromuse Inc. (Nasdaq:MUSE), the leading provider of service and business assurance software, announced today that effective December 31, 2002, Greg Brown is resigning as Chairman and Chief Executive Officer.Simultaneous with this announcement, Motorola Inc. announced today that Mr. Brown has been named Executive Vice President of Motorola Inc. and President and CEO of Motorola's Communications, Government, and Industrial Solutions Sector (CGISS). Mr. Brown will retain his seat on the Micromuse Board of Directors. Dave Schwab, who has served on Micromuse's Board of Directors since 1996 and is a General Partner at Sierra Ventures, will assume the role of non-executive Chairman of the Board of Micromuse on January 1, 2003.Micromuse's Senior Vice President and Chief Financial Officer, Mike Luetkemeyer, will retain his CFO responsibilities and assume the role of Micromuse CEO on an interim basis starting January 1, 2003.Micromuse also announced today that the company expects to meet or exceed current First Call consensus estimates for revenue and pro forma earnings per share in the quarter ending December 31, 2002. "During his successful tenure as Micromuse's CEO, Greg Brown has built a highly effective management team, a loyal global customer base, and a powerhouse sales and channel program. I am incredibly pleased for Greg and believe that his appointment as President and CEO of one of Motorola's largest sectors justly rewards his accomplishments and reflects very positively on Micromuse," said board member, Dave Schwab. "My board colleagues and I are proud of our longstanding association with a company that has established a solid financial track record and achieved such a clear, sustained leadership role in the market. We look forward to supporting Mike Luetkemeyer and the senior management team through this transition period."Micromuse Inc.