BT Global Services to Talk on Increasing Operational Efficiencies and Revenue Generation with Micromuse's Netcool(R) Solutions; Netcool(R) Solutions Help BT Global Services Save More Than GBP 736,000 in Annual Operational Efficiencies.

SAN FRANCISCO -- Micromuse Inc. (Nasdaq: MUSE), the leading provider of ultra-scalable, realtime business and service assurance software, today announced that Mr. Peter Hascher, Head of CIO NMS at BT Global Services, will deliver keynote presentations at Micromuse's Netcool Users Conferences in Japan, Singapore, and China in November 2005. Mr. Hascher will deliver a case study presentation at each event showcasing how UK-based BT Global Services is achieving substantial operational efficiencies, cost savings and additional revenue with Netcool solutions.

"I am pleased to share the success of BT Global Services with Netcool users in the Asia Pacific region," said Peter Hascher, Head of CIO NMS, BT Global Services. "Netcool solutions have saved BT Global Services a total of GBP 736,000 per annum; largely due to the increased operational efficiency generated by cross-platform alarm correlation, alarm enrichment, and semi-automatic trouble ticket creation."

Mr. Hascher's presentation will address how Netcool solutions enable the organization to reduce the numbers of raw network alarms that are presented to operators from 17.5 million per month to just 7,000 on one particular network alone. "Efficiencies such as these are supplemented by an additional saving of GBP 171,000 per annum in reduced support and maintenance costs across software, licenses and hardware," said Mr. Hascher. "Perhaps most importantly, BT Global Services' world class networks and service delivery enables BT to win significant new business. Based on the relevance of the Netcool solutions, we determine that the Netcool solution has contributed GBP 190,000 per annum in additional profit."

BT is one of the world's leading providers of communications solutions serving customers in Europe, the Americas, and Asia Pacific. Its principal activities include networked IT services, local, national and international telecommunications services and higher-value broadband and internet products and services. BT Global Services, one of the three main lines of business of BT, provides networked IT services to meet the needs of multi-site organizations globally. BT Global Services operates in more than 130 countries and also offers international carrier services.

Mr. Hascher will join senior Micromuse executives to speak at Micromuse's Netcool Users Conferences to be held in Tokyo, Japan on November 7th; in Singapore on November 9th and in Hainan, China on November 11th. Registration for the Netcool Users Conferences is available here: http://www.micromuse.com/events/user_conf

About BT

BT is one of the world's leading providers of communications solutions serving customers in Europe, the Americas, and Asia Pacific. Its principal activities include networked IT services, local, national and international telecommunications services, and higher-value broadband and internet products and services.

BT Group plc is listed on stock exchanges in London and New York. British Telecommunications plc (BT) is a wholly-owned subsidiary of BT Group and encompasses virtually all businesses and assets of the BT Group. For more information, visit www.bt.com/aboutbt

About Micromuse

Micromuse Inc. (Nasdaq: MUSE) is the leading provider of ultra-scalable, realtime business and service assurance software solutions. The Netcool(R) software suite provides organizations with the assurance that their IT systems are supporting and driving profits 24 hours a day. Unlike traditional infrastructure management systems, Netcool solutions provide realtime end-to-end visibility and accurate troubleshooting from a business perspective. Such business intelligence allows organizations to respond to problems quickly, streamline workflow processes and improve business uptime. Micromuse customers include BT, Cable & Wireless, Deutsche Telekom, EarthLink, ITC DeltaCom, JPMorgan Chase, MCI, T-Mobile, and Verizon. Headquarters are located at 650 Townsend Street, San Francisco, Calif. 94103; [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's ability to manage its growth (including the ability to hire sufficient sales and technical personnel), the risks associated with the expansion of the Company's distribution channels, the risk of new product introductions and customer acceptance of new products; the rapid technological change which characterizes the Company's 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's 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.