Sun Microsystems Peter Cunningham To Keynote Micromuse's European Netcool Users Conference 2001.

Business Editors

SAN FRANCISCO--(BUSINESS WIRE)--May 3, 2001

Micromuse Inc. (Nasdaq: MUSE), the leading provider of realtime fault management and service assurance software, today announced that Peter Cunningham, Vice President, Sun Professional Services, EMEA, will deliver the keynote address on May 25th at its 3rd annual European Netcool(R) Users Conference 2001. The conference will be held at the Hilton Hotel in Brussels, Belgium, from May 23rd through May 25th. May 23rd will be a one-day informational event designed for Micromuse's Authorized Channels Partners. May 24th and 25th will be a two-day educational forum for customers of Micromuse's Netcool software suite.

Sun Microsystems signed a global reseller agreement with Micromuse in March 2001. Under the agreement, Sun Microsystems Professional Services group is reselling, integrating and supporting Micromuse's Netcool(R) solutions around the world.

"I am delighted to present this year's keynote address at Micromuse's European Netcool Users meeting," said Mr. Cunningham. "Sun and Micromuse are building a highly synergistic relationship. Together we're offering rapidly deployable management solutions for future-proofing our customer's businesses. I'm looking forward to meeting our mutual customers and to discussing the rapid changes in the European marketplace."

Robert Lloyd, Cisco Systems Senior Vice President, EMEA, will be presenting the keynote address on May 24th, the first day of the Netcool Users Conference. Mr. Lloyd will discuss current industry trends and the expansion of networking technologies on the European continent.

"Our goal at this conference is to help our customers and partners keep pace with the rapidly changing dynamics of the software industry," said Mike Donohue, Micromuse's Senior Vice President Sales & Business Operations. "This interactive forum provides them with an opportunity to learn about the latest tools, trends and challenges in network management. Having enjoyed a noteworthy and rewarding relationship with Sun Professional Services on a global scale, it is fitting that Peter will provide insight on differentiating services and integrating solutions."

This year's European Netcool(R) Users Conference will feature numerous technical sessions and Micromuse partner seminars addressing current and future technology issues related to maintenance, upgrading and deployment of network operations solutions. These sessions will provide valuable insight from experts who understand the business and technical advantages of developing best-of-breed management solutions based on Micromuse's Netcool suite. Attendees will also have the opportunity to hear success stories and insights from other Micromuse customers and partners, as they discuss the most salient ideas, trends and technologies that are driving the network management industry in 2001 and beyond.

For additional conference information, please visit the Micromuse Web site at http://www.micromuse.com/news/emea_users2001/.

About the Netcool(R) Suite

Micromuse's Netcool(R) software suite collects management data from more than 300 management environments and network devices, including voice, data and Internet. Fault data is rapidly processed and filtered by the Netcool ObjectServer(TM) an in-memory database. The Netcool suite helps operators to build views of service availability in realtime, helping them manage networks more efficiently. Because it is scalable and deploys rapidly, the Netcool suite helps service providers to expand their networks as their markets grow.

About Micromuse

Micromuse Inc. (Nasdaq: MUSE) is the leading provider of realtime fault management and service assurance software. Micromuse's recent list of awards include the TeleStrategies OSS Excellence Award for Best New Product for the Netcool(R)/Visionary(TM) application, and Web Hosting Magazine Editor's Choice Award. In addition, Micromuse has been recognized in the Forbes 500, Bloomberg's Top 100 Stocks, the Barron's 500, Deloitte & Touche's Technology Fast 500, San Francisco Chronicle 500, Individual Investor's Index of America's Fastest Growing Companies and Network World's NW200. Micromuse customers include AT&T, BT, Cable & Wireless, Cellular One, Charles Schwab, Deutsche Telekom, Digex, EarthLink, ITC DeltaCom, MCI Worldcom, One2One, Verizon, XO Communications and a number of financial investment concerns. Headquarters are located at 139 Townsend Street, San Francisco, Calif. 94107; [phone]. The Web site is at www.micromuse.com.

Micromuse and Netcool are registered trademarks of Micromuse Ltd. All other trademarks and registered trademarks in this document are the properties of their respective owners. Any statements contained in this press release that do not describe historical facts may constitute forward-looking statements as that term is defined in the Private Securities Litigation Reform Act of 1995. Any forward-looking statements contained herein are based on current expectations, but are subject to a number of risks and uncertainties.

The factors that could cause actual future results to differ materially from the forward-looking statements include the following: fluctuations in customer demand, the Company is ability to manage its growth (including the ability to hire sufficient sales and technical personnel), the risks associated with the expansion of the Company is distribution channels, the risk of new product introductions and customer acceptance of new products; the rapid technological change which characterizes the Company is markets, the risks associated with competition, the risks associated with international sales as the Company expands its markets, and the ability of the Company to compete successfully in the future, as well as other risks identified in the Company is Securities and Exchange Commission Filings, including but not limited to those appearing under the caption "Risk Factors" in the Company's most recent Quarterly Reports on Form 10-Q and on Form 10-K on file with the Securities and Exchange Commission and available on the Company's Web site.