INFORMATICA AND SIEBEL SYSTEMS FORM ALLIANCE

PALO ALTO, Calif. and SAN MATEO, Calif., July 20, 2000 -- Informatica Corporation (NASDAQ: INFA), a leading provider of integrated analytic solutions for eBusiness, and Siebel Systems (NASDAQ: SEBL), the world's leading provider of eBusiness application software, today announced an alliance to integrate Informatica's analytic applications and data-integration software components with Siebel eBusiness Applications.

The combined solution will allow customers implementing Siebel eBusiness Applications to combine front-office, back-office and external data into comprehensive customer data marts. This will allow marketers to better analyze and understand the diverse needs of their customers, provide more targeted products and services, and significantly increase customer satisfaction and retention.

"Informatica's data integration software has emerged as the industry standard for transforming enterprise information assets into strategic business information," said Richard Gorman, vice president of product marketing at Siebel Systems. "The alliance between Siebel Systems and Informatica will allow companies to gain strategic insight into their business by providing the ability to analyze Siebel data with data from back-office and legacy applications."

"Siebel Systems is the undisputed leader in eBusiness application software. Siebel Systems' eBusiness expertise and Informatica's scalable products for eBusiness analysis will create a powerful solution for our joint customers," said Diaz Nesamoney, president and chief operating officer of Informatica. "Through this alliance, we will now offer the market a new generation of innovative eBusiness solutions that will enable companies to gain a competitive advantage by improving their relationships with customers."

About Siebel Systems

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

About Informatica

Informatica provides e-business analytic solutions that enable companies to leverage business insight for competitive advantage. Informatica's products include a comprehensive suite of analytic applications and the industry's most powerful data integration platform. Over 880 customers, including more than half of the Fortune 100, rely on Informatica to analyze and improve their entire e-business value chain. Informatica's customers include 3Com, AMD, Boeing, Chevron, Cisco, CNET, Deutsche Bank, eBay, GE, Inktomi, Merrill Lynch, MetLife, MCI WorldCom, Mutual of Omaha, Polo Ralph Lauren, Preview Travel, Priceline.com, Sprint and Zurich Insurance. For more information, call 800.970.1179, or visit Informatica's Web site at www.informatica.com/.

This press release contains forward-looking statements as defined under The Securities Litigation Reform act of 1995. Forward-looking statements in this release include statements regarding Informatica's mission to lead the market for e-business analytic solutions and the company's ability to offer its customers a competitive advantage. Factors that could cause actual results to differ materially include risks and uncertainties such as unforeseen technical difficulties in developing and enhancing our analytic solutions, and new product introductions and enhancements by competitors, as well as additional risk factors outlined in our Annual Report on Form 10-K for the year ended December 31, 1999 and updated in our report on Form 10-Q for our quarter ended April 30, 2000. Informatica assumes no duty to update any of the forward-looking statements in this release.

NOTE: Informatica is a registered trademark of Informatica Corporation. All other company and product names may be trademarks of their respective owners.

Media Contacts:

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

Sara Miles
VisiTech PR
(602) 808-9914
sara@visitechpr.com