Cable & Wireless Teams with Keynote to Provide Web Performance Measurement, Management and Testing Services to Customers.

Business Editors/High-Tech Writers

SAN MATEO, Calif.--(BUSINESS WIRE)--April 21, 2003

Keynote Systems (Nasdaq:KEYN), the global leader in Web performance management services, today announced that Cable & Wireless (NYSE:CWP), the global telecommunications group, will resell Keynote's performance measurement, management, diagnostic and testing services to its customers.

Under the agreement, Cable & Wireless will resell Keynote's performance monitoring and testing services including:

-- Web Site Perspective(R) that measures Web site performance

from multiple points on the Internet, to diagnose performance

problems and measure the speed and reliability of Web sites;

-- Transaction Perspective(R) which delivers full network-level

and user-level statistics and error messages for every element

of every page in the transaction allowing transaction

performance problems to be quickly and accurately identified,

diagnosed and repaired, ensuring an optimal quality of

experience for end-users and mitigating bottom-line business

impact;

-- Test Perspective(R), a self-service testing service which

allows IT personnel to run instant integrity tests, load tests

and diagnostic tests and receive immediate feedback on

modifications made to the Web site or any other aspect of the

network to ensure that overall performance has not degraded.

"Through our relationship with Keynote, we will offer our customers reliable, cost-efficient Web performance monitoring and measurement services that complement our hosting and IP solutions," said Simon Cunningham, CEO, Cable & Wireless America. "Standardizing on the Keynote platform allows us to reduce costs and concentrate on our core competencies while outsourcing to Keynote the services it does best. We now offer a single, cost-effective performance management and monitoring solution with wide geographical coverage and advanced features to meet the needs of our multi-national customers."

"By reselling our services through Cable & Wireless we are executing on one of our key goals: making Keynote's easy-to-use and cost-effective services readily available to enterprise companies that are hosted by large service and hosting providers," said Umang Gupta, chairman and CEO of Keynote. "By increasing the breadth of value-added services for partners, Keynote's partner program helps resellers generate additional revenue and business growth."

Along with industry leading enterprise companies Computer Associates, HP, and Micromuse, Cable & Wireless now joins the ranks of Keynote's elite strategic alliance program which supports the company's 'Total Performance Management' strategy to supply enterprise companies with complete solutions delivered by Keynote and KeyPartners for benchmarking, testing and managing the end-to-end performance of e-business applications and systems. Keynote's goal is to enable enterprise customers to leverage existing management software, increase the number of satisfied customers, reduce unnecessary capital expenditures, provide competitive advantage and deliver an optimal quality of experience to end users.

About Keynote

Keynote Systems (Nasdaq:KEYN), The Internet Performance Authority(R), is the global leader in Internet performance management services that improve the quality of e-business. Keynote's services enable corporate enterprises to benchmark, diagnose, test and manage their e-business systems both inside and outside the firewall. Approximately 2,400 corporate IT departments and 18,000 individual subscribers rely on the company's easy-to-use and cost-effective services to optimize revenues and reduce downtime costs without requiring additional complex and costly software implementations.

Keynote Systems, Inc. was founded in 1995 and is headquartered in San Mateo, Calif. The company can be reached at www.keynote.com or by phone in the U.S. at 650/403-2400.

Keynote, The Internet Performance Authority and Perspective are registered trademarks of Keynote Systems, Inc. Other trademarks are the property of their respective owners.

Note to press: Call Keynote's media and analyst-relations hotline at 650/403-3254 to request further information on Keynote Systems, Inc. or an interview.