Micromuse Inc., the leading provider of ultra-scalable, realtime business and service assurance software, today announced that NTT Communications Corporation has chosen the Netcool(R) suite of products to provide a strategic infrastructure backbone to support service availability, quality, and automation of its new and innovative AGILIT service. Headquartered in Tokyo, Japan, NTT Communications' recently launched AGILIT to provide advanced hosting applications service for large corporations.

"AGILIT leverages its strength as a world-class telecommunications provider along with its significant investment IT infrastructure to provide a fully automated applications and systems hosting service, offering a guaranteed 100% service level agreement to Japan's leading companies," said Mr. K. Yozawa, Vice President, Business Infrastructure Services Department, IT Management Services Business Division, NTT Communications Corporation.

"Micromuse's Netcool(R) solutions are helping AGILIT meet its business goals by guaranteeing 100% service uptime together with the highest levels of service quality and highest degree of data center automation in the market today."

Micromuse's Netcool solutions are helping to support the AGILIT service, which was developed in response to the market's need to lessen the increasing complexity of distributed networks, growth of internet technologies, and the combination of servers and applications through automation. AGILIT's hosting services benefit end-user customers through reduced operating costs associated with automating server and data center environments while improving security and quality of modern IT environments.

Netcool software, which is currently in use at several groups within the NTT Communications Corporation, was selected by the AGILIT service team to provide consolidated operations management, event correlation, data analysis and data presentation for AGILIT's services. The Netcool solutions allow network operators to consolidate all network, systems and applications event data into a single view on one screen to enable the fast identification and prioritization of service-affecting problems on the infrastructure. NTT Communications Corporation implemented the Netcool(R) Dashboards(TM) solution to accurately monitor the availability and performance of host systems and the applications running over them. NTT Communications Corporation also deployed Micromuse's Netcool(R)/Precision(TM) application for accurate network topology and connectivity information. The complete Netcool solution provides a realtime, end-to-end view of the service-delivery infrastructure and a true, clear picture of the root cause of the problem to enable the efficient use of operational resources in support of service uptime and quality.

"Micromuse is clearly the vendor of choice for large, advanced telecommunications operators that require cost-efficient solutions to help them bring premier value-added services to market quickly," said Hiro Ichihara, Micromuse's Vice President and Country Manager for Japan. "Netcool's ability to scale to handle the large volume of data generated by applications, systems and network devices and to consolidate that data into a single view is invaluable in helping service providers maintain their strong brand values, minimize costs and provide a fast return on investment."

About NTT Communications

NTT Communications Corporation is a subsidiary of Nippon Telegraph and Telephone (NTT) Corporation (NYSE: NTT) - one of the world's largest telecommunications companies. NTT Communications Corporation provides high-quality, technologically advanced network management, security and solution services to consumers, corporations and governments on a global basis. Its stated mission is to become the world-leading Global IP Solutions company offering access to more than 200 countries. NTT Communications Corporation has more than 30 companies in the Asia-Pacific region, Europe and the Americas. The company has garnered several awards for its leading edge technologies, outstanding performance and customer service, including "Best Global Carrier - 2004." For more information, please visit www.ntt.com or www.ntt.com/agilit/index.html

About Netcool

Micromuse's Netcool(R) software solutions provide businesses with the assurance that their applications and services are up and operating. By allowing our customers to see what's happening throughout the infrastructure in realtime, Netcool applications enable them to respond to problems before revenue-supporting services are affected.

Netcool applications install out-of-the-box, deploy rapidly and scale to the largest environments. Micromuse's flagship, Netcool/OMNIbus(TM) application, includes a library of off-the-shelf software modules that allow our customers to collect and consolidate information from more than 1,000 environments spanning applications, systems, voice and IP, cable/broadband, switches and routers, and enterprise management systems.

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, J.P. Morgan Chase, MCI, T-Mobile, and Verizon. Headquarters are located at 139 Townsend Street, San Francisco, Calif. 94107; (415) 538-9090. 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 we make are based on current expectations, and are subject to a number of risks and uncertainties. Actual results could differ materially.

Factors that could cause actual future results to differ materially from the forward-looking statements include: fluctuations in customer demand; the Company's ability to manage its growth (including the ability to hire sufficient sales and technical personnel); risks associated with the expansion of the Company's distribution channels; risk of new product introductions and customer acceptance of new products; rapid technological change which characterizes the Company's markets; risks associated with competition; risks associated with international sales; and the ability of the Company to compete successfully in the future; as well as risks relating to pending litigation, the completed restatement of certain of our financial statements, and other matters appearing under the caption "Risk Factors" in the Company's most recent Quarterly Reports on Form 10-Q and Form 10-K filed with the SEC and available on the Company's website. The Company disclaims any obligation or intention to update or revise any forward-looking statements.