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SIEBEL SYSTEMS INCORPORATES INFORMATICA'S DATA INTEGRATION PLATFORM INTO SIEBEL eBUSINESS ANALYTICS 2000.3

Combined solution to offer Siebel eBusiness Analytics users a 360-degree view of customers

PALO ALTO and SAN MATEO, Calif., Nov. 29, 2000 - Informatica Corporation (NASDAQ: INFA), a leading provider of eBusiness analytic software, and Siebel Systems, Inc. (NASDAQ: SEBL), the world's leading provider of eBusiness applications software, today announced that Siebel Systems has incorporated Informatica's data integration platform within Siebel eBusiness Analytics 2000.3. Launched today as part of the enhanced and expanded Siebel eBusiness 2000.3 application suite, Siebel eBusiness Analytics provides executives and managers with powerful insight into their customer base and multichannel eBusiness operations, including sales, marketing and service activities.

The integrated solution will help customers implementing Siebel eBusiness Applications to consolidate front-office, back-office and external data into a comprehensive eBusiness data warehouse for a complete view of their customers. This holistic view will help organizations drive business results by providing valuable insight into customer behavior and improving their ability to develop and refine sales, marketing and service strategies.

"Informatica is widely recognized in the industry for its ability to unite disparate sources of data from across the extended enterprise for analysis," said Dan Lackner, vice president and general manager of Marketing Automation and eBusiness Analytics Products at Siebel Systems. "Informatica's data integration platform and open framework allow Siebel Systems to offer global organizations a 360-degree view of the customer as well as the scalability and flexibility they require."

"As the world's leading provider of eBusiness application software, Siebel Systems has established a strong track record for helping organizations acquire, retain and service their customers," said Diaz Nesamoney, president and COO of Informatica. "The combination of Siebel eBusiness Applications and Informatica's market-leading data integration software offers organizations a powerful, customer-focused analytic solution that they can leverage for competitive advantage."

Informatica's data-integration software will help users of Siebel eBusiness Applications transform legacy, relational and eBusiness data into reliable information for strategic analysis. Siebel eBusiness Analytics enables comprehensive, insightful analysis of the continuous customer dialogue across the entire organization, including customers, sales and service, products, competitors and channels.

Siebel eBusiness Analytics works seamlessly with Siebel eBusiness Applications, delivering robust online analytical processing (OLAP) capabilities. Siebel eBusiness Analytics combines front-office, back-office and external data into a comprehensive and open pre-built eBusiness data warehouse, and offers out-of-the-box tools for in-depth analyses and reporting. Sales, marketing and service professionals, business analysts, line-of-business managers and executives can use Siebel eBusiness Analytics to make informed and timely decisions based on a complete view of customer relationships.

About Siebel Systems

Siebel Systems, Inc. is the world's leading provider of eBusiness applications software. Siebel Systems provides an integrated family of eBusiness applications software enabling multichannel sales, marketing and customer service systems to be deployed over the Web, call centers, field, reseller channels, retail and dealer networks. Siebel Systems' sales and service facilities are located in more than 28 countries. For more information, please visit Siebel Systems' Web site at http://www.siebel.com/.

About Informatica

Informatica provides eBusiness analytic software that enables companies to leverage business insight for competitive advantage. More than 1,000 global customers, including over half of the Fortune 100, leverage the Informatica Insight Network to integrate, analyze and personalize critical business information to improve business performance and responsiveness across the entire business value chain. Informatica's products include a comprehensive suite of analytic applications, the industry's most powerful data integration platform and a wide range of supporting services and partnerships. The company's list of leading customers includes 3Com, AMD, American Airlines, Boeing, Borders Group, Chevron, Cisco, CNET, Deutsche Bank, eBay, GE, Hewlett-Packard, Inktomi, J. Crew, Merrill Lynch, MetLife, MCI WorldCom, Motorola, Mutual of Omaha, Philips, Polo Ralph Lauren, Preview Travel, Priceline.com, Sprint and UBS. For more information, call 800.970.1179, or visit Informatica's Web site at http://www.informatica.com/.

Except for historical information, the matters discussed in this press release include forward-looking statements, within the meaning of Section 27A of the Securities Exchange Act of 1934, as amended. These include statements relating to the market acceptance and performance of Informatica's products which are incorporated into the Siebel products mentioned herein. Such forward-looking statements are subject to certain risks and uncertainties that could cause actual results to materially differ from those projected. Informatica's business is subject to several risks, including fluctuations in Informatica's operating results, rapid technological change, market acceptance of Informatica's new products and services and the highly competitive marketplace in which Informatica competes, as well as others. For the discussions of the risk factors related to our business, see the risk factors contained in Informatica's Annual Report on Form 10-K for the fiscal year ended December 31, 1999 and other filings with the Securities and Exchange Commission. Informatica assumes no obligation to update or supplement forward-looking statements that become untrue because of subsequent events.

NOTE: Informatica and the Informatica Insight Network are trademarks or registered trademark of Informatica Corporation. Siebel is a trademark of Siebel Systems, Inc., and may be registered in certain jurisdictions. All other company and product names may be trademarks of their respective owners.

Contact:

Samantha Moore
Informatica Corporation
(650) 687-6361
smoore@informatica.com

Kate Jobling
Access Communications (for Siebel)
(415) 904-7070
kjobling@accesspr.com