Seattle Mariners Take the Lead in Upgrading To Onyx Enterprise CRM 4.0
Implementation Completed in Less Than Four Weeks

Seattle — Onyx® Software Corp. (Nasdaq: ONXS) today announced that Major League Baseball’s Seattle Mariners have successfully upgraded to the latest version of the Onyx customer relationship management (CRM) suite, Onyx Enterprise CRM 4.0. The Mariners, one of the first Onyx customers to go live on Onyx 4.0, completed the implementation in less than four weeks. Onyx made the announcement at an Onyx 4.0 launch event for customers, prospects, partners, analysts and members of the press at SAFECO Field in Seattle, the home of the Mariners.

The Seattle Mariners have been achieving benefits with Onyx CRM since the organization first began using the product during the 2001 off-season. Today, the Mariners use Onyx to manage six revenue streams across multiple departments, including the sales, marketing, service, support, community relations and event management divisions.

"Our fans are the lifeblood of our business. Win or lose, we pride ourselves on putting the fans first," said Chuck Armstrong, president of the Seattle Mariners. "Just having the right attitude isn’t enough. We need the technology and systems to support these goals, and Onyx has been a tremendous help to us in improving the way we interact with our customers. Our implementation of Onyx came at a time of huge increases in our season ticket and fan base. The Onyx system has helped us handle that growth and ensure that we’re taking good care of our customers."

In 2002, the Mariners season ticket base increased from 19,740 to 23,608, the highest single season total in team history. With Onyx software, the Mariners have been able to centralize all fan-related information and are better able to manage all ballpark operations. Via the Onyx Customer Portal, the Mariners have tailored customer service and support activities, and managed season-ticket holder, suite and sponsorship sales using the automated system. Using customer data pulled from the Onyx system, the Mariners conduct market analysis to organize tailored promotions for specific customer segments.

Onyx Enterprise CRM 4.0 is the fourth Internet-based version of Onyx’s CRM suite. Built entirely on standards-based Internet technologies including XML, Onyx 4.0 is completely Web-based, integrates fully with other enterprise applications, and is designed with usability and cost-effectiveness in mind. This latest version includes support for Oracle database applications on various platforms.

About Onyx Software
Onyx Software Corp. is a global supplier of customer relationship management (CRM) enterprise applications that power a company’s entire business world, connecting sales, marketing and service organizations with customers, prospects and partners. Through an innovative mix of Internet technology, strategic services and customer commitment, Onyx helps companies create the seamless, branded customer experiences they need to forge competitive advantage and build real business value. Its reliable, scalable, flexible, holistic solutions enable companies to attract, acquire and retain customers and partners across all channels and touch points. Onyx customers include American Express Co., Broadwing Inc., Commerce One Operations Inc., Credit Suisse, Dreyfus Corp., Prudential Investments and The Regence Group. More information can be found at (888) ASK-ONYX or info@onyx.com.

This press release contains forward-looking statements, including statements about Onyx Enterprise CRM 4.0. Forward-looking statements are based on the opinions and estimates of management at the time the statements are made and are subject to risks and uncertainties that could cause actual results to differ materially from those anticipated in the forward-looking statements. The words "believe," "expect," "intend," "anticipate," variations of such words, and similar expressions identify forward-looking statements, but their absence does not mean that the statement is not forward-looking. These statements are not guarantees of future performance and are subject to risks, uncertainties and assumptions that are difficult to predict. Factors that could affect Onyx’s actual results include, but are not limited to, the market acceptance of the Oracle version of Onyx Enterprise CRM 4.0 and the "Important Factors That May Affect Our Business, Our Results of Operations and Our Stock Price" described in our annual report on form 10-Q for the period ended March 31, 2002. Readers are cautioned not to place undue reliance upon these forward-looking statements that speak only as to the date of this release. Onyx undertakes no obligation to update publicly any forward-looking statements to reflect new information, events or circumstances after the date of this release or to reflect the occurrence of unanticipated events.

Onyx is a registered trademark of Onyx Software Corp. in the United States and other countries.
Other product or service names mentioned herein are the trademarks of their respective owners.

Contact:

Bob Craig Onyx Software 617-314-6846

Joan Speich Waggener Edstrom Telephone: 503.443.7265 Fax: 503.443.7001

Rebecca Hale Mariners (206) 346-4324

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MEDIA CONTACTS

Americas / Corporate Headquarters Mitch Briggs Public Relations Coordinator Consona Corporation Telephone: 317.249.1620 Mobile: 317.829.4210 Europe, Middle East, Africa Richard Furby Managing Director, Onyx UK Telephone: +44 (0) 1344 322 199 Fax: +44 (0) 1344 489 035 Japan Daisuke Sawamura Director, Professional Services Telephone: +81 03 5215 7311