Singapore's SingTel Deploys Micromuse's Netcool(R) Solution for Assurance of Fixed Line and Mobile Service Delivery Infrastructure; Netcool(R) Solutions Deliver End-to-End Service Visibility via Executive-Level Realtime Dashboards.

SAN FRANCISCO -- Micromuse Inc. (Nasdaq: MUSE), the leading provider of ultra-scalable, realtime business and service assurance software, today announced that Singapore Telecommunications Limited (SingTel), has implemented the Netcool solution to deliver enhanced service assurance, visibility and service level metrics for its fixed line and mobile voice and data networks. SingTel has significant operations in Singapore and Australia as well as a further presence in 35 cities across 17 countries.

"SingTel continues to invest in our extensive communications infrastructure to ensure the delivery of consistent, reliable and quality service uptime to our customers," said Mr. Hoh Wing Chee, SingTel's Vice President of Network Operations. "The Netcool solution, which we are implementing for our new Integrated Network Operations Support System in Singapore, will enable us to view, assess and proactively manage our fixed and mobile network infrastructure as well as services from a single point of control. It will help improve our efficiency as we consolidate and automate our functions."

Micromuse's Netcool solutions provide an end-to-end service assurance, service quality management, and consolidated operations management platform across SingTel's fixed line and mobile networks. Utilizing the Netcool solutions, SingTel's operations staff can gain a centralized, realtime, web-enabled service level view of consumer and corporate services. This helps staff to monitor and manage the performance, availability and status of its service-delivery infrastructure and to quickly identify and prioritize infrastructure faults before they impact customer service or breach service level agreements.

NCS Communications Engineering Pte. Ltd. (NCSCE), the system integrator, and Fastwire, a Micromuse channel partner, delivered the design and implementation of SingTel's network and systems management infrastructure to ensure the rapid implementation of the Netcool solutions and to deliver a management solution that provides SingTel with a scalable service assurance platform and earlier return on investment.

"Micromuse is pleased to be delivering strategic service assurance solutions to SingTel," said Matthew Wee, South East Asia Regional Director for Micromuse. "Micromuse's Netcool solutions enable timely, accurate and integrated service level views for large, complex IT infrastructures, helping the world's largest service providers to provide enhanced customer care, product innovation and service quality."

About SingTel

SingTel is Asia's leading communications group with operations and investments around the world. Serving both the corporate and consumer markets, it is committed to bringing the best of global communications to customers in the Asia Pacific and beyond.

With significant operations in Singapore and Australia (through wholly-owned subsidiary SingTel Optus), the Group provides a comprehensive portfolio of services that include voice and data services over fixed, wireless and Internet platforms.

The Group also has major investments in Bangladesh, India, Indonesia, the Philippines and Thailand. Together with its regional partners, SingTel is Asia's largest multi-market mobile operator, serving more than 71 million customers in seven markets.

SingTel employs more than 19,000 people worldwide and had a turnover of S$12.62 billion (US$7.65 billion) and net profit after tax of S$3.27 billion (US$1.98 billion) for the year ended 31 March 2005. More information can be found at www.singtel.com and www.optus.com.au.

About Fastwire

Fastwire is the solution architect of choice for Asia's leading service providers. We are a systems integrator providing advanced technology solutions, specializing in the design, implementation and support of turnkey OSS and network solutions.

Fastwire's consultants have attained the highest level certification in key technology areas. Whatever stage your business is at, Fastwire can help. Fastwire maximizes value to our customers through a unique consulting process which delivers a tailor made package to meet your specific requirements. From this Fastwire produces a turnkey solution that you know works.

Fastwire was established in 1998, with offices in Sydney (HQ), Melbourne, Canberra, New Zealand and Singapore. The website is www.fastwire.com.sg.

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.