BELLEVUE, Wash., and SEATTLE - Offering businesses a complete solution for large-scale integrations of customer relationship management (CRM) applications, Onyx Software Corp. (NASDAQ: ONXS), and Avanade Inc., a joint venture between Microsoft and Accenture, have formed an alliance to deliver Onyx's CRM solutions on the Microsoft .NET Enterprise Server. Through this strategic alliance, Avanade and Onyx will offer end-to-end CRM solutions which provide the scalability and reliability that today's customers demand, while maintaining the flexibility to support future pervasive computing paradigms.

"Onyx was a natural choice for partnership, because its products offer significant functionality, performance, and scalability on the Microsoft platform, and Avanade is committed to delivering value to customers using Microsoft technology," said Avanade CEO Mitch Hill. "Avanade's technology integration expertise complements Onyx's understanding of the business variables inherent in complex integrations. Together, we will deliver solutions to our customers with the speed and strategy necessary to drive success."

Already proven through customer engagements, the partnership enhances the momentum of Onyx's commitment with Microsoft to offer CRM solutions on Windows 2000 and .NET Enterprise Servers, including SQL Server 2000 database. With Avanade, Onyx can rapidly deploy its scalable CRM products to enterprise-class organizations that base their systems on Microsoft solutions.

"We're excited by the potential of Avanade and Onyx to speed the adoption and success of industry-specific, enterprise-class CRM solutions on Microsoft .NET Enterprise Servers," said Ian Rogoff, vice president, Worldwide Partner Group, Microsoft. "Uniting the expertise of Avanade and Onyx will help businesses worldwide quickly deploy strategic solutions that bring a new level of agility and significantly improve customer relationships."

"For our large customers with complex enterprise CRM requirements, Avanade provides the technical expertise necessary to achieve maximum return on investment," said Brent Frei, CEO of Onyx. "By combining Avanade's strengths as an integrator with our own go-to-market strategies and technology, we can help our clients accelerate revenue and build enduring business value across the enterprise."

Together, the two companies intend to:

• Provide customers with the advanced mainframe-class enterprise capabilities of the Onyx Enterprise 2001 CRM application by supporting the broad range of Microsoft Windows 2000 Servers.
• Assist customers in multi-national, multi-language CRM system rollouts.
• Provide integration of Onyx's CRM products with third-party applications, including enterprise resource planning, billing, e-commerce and legacy transaction systems, via Microsoft's BizTalk Server.
• Enable wireless access to critical Onyx CRM functionality for mobile workforces.
• Deliver support for the Microsoft Windows XP Smart Tag initiative.

With more than 1,000 employees throughout Europe, Asia-Pacific, and the Americas, Avanade provides cutting-edge technology integration services to Global 2000 companies and emerging market-makers. Additional information can be found on the Avanade Website at www.avanade.com.

About Onyx Software
Onyx Software Corp. (NASDAQ: ONXS) is a global supplier of customer-centric e-business enterprise applications that power a company's entire business world, connecting sales, marketing and service organizations with customers and partners. Onyx products deliver the critical functionality needed to attract, acquire and retain partners and customers across all channels and touch points providing the flexibility, reliability and scalability needed to realize a high return on investment and forge a competitive advantage in today's marketplace. Onyx offers the comprehensive mix of technology, strategic services and implementation support to deliver enterprise business value through a branded, seamless customer experience. Onyx customers include American Express, Broadwing, Commerce One, Credit Suisse, Dreyfus, FirstWorld Communications, Portland Trail Blazers, Prudential Investments and Sierra Health Services. Get more information at 888-275-6699, info@onyx.com.

This press release contains forward-looking statements. Forward-looking statements are based on the opinions and estimates of management at the time of 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 "Important Factors That May Affect Our Business, Our Results of Operations and Our Stock Price" described in our quarterly report on form 10-Q for the quarter ending March 31, 2001. 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.

Contact:

Shawn Yujuico VisiTech Public Relations 817.267.9686

Tiffany Pence Fleishman-Hillard for Avanade 415.356.1023, x127

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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