Bellevue, Wash. - Onyx Software Corporation (NASDAQ: ONXS) has passed the certification program for Microsoft® Windows® 2000 Server and Advanced Server. The rigorous testing process, conducted by an independent PC testing lab, validates that Onyx applications can leverage the reliability and scalability built into the Microsoft Windows 2000 platform, providing a lower cost of ownership for joint Onyx and Microsoft customers.

Onyx received certification for Onyx Enterprise Application Server (OEAS), the company’s new XML-based customer management platform. OEAS is designed to give large, complex enterprises a single, flexible platform for effectively managing mission-critical customer and partner relationships in a highly personalized and targeted way. The object-based OEAS platform enables customers to integrate directly to other enterprise-class systems and middleware products through industry standard technologies, including Extensible Markup Language (XML), Component Object Model (COM) or Simple Object Access Protocol (SOAP).

"Companies need an infrastructure that delivers high reliability, scalability and seamless integration with existing enterprise applications and systems," said Peter Conway, senior director of Windows Server Marketing, Microsoft. "Onyx’s OEAS certification on both Windows 2000 Server and Advanced Server demonstrates that they have met the comprehensive specifications that encompass the core enterprise server features."

"Onyx’s certification on Advanced Server ahead of its primary competitors further demonstrates Onyx’s leadership in delivering scalable CRM solutions on the Microsoft technology platform," said Bill Bunker, vice president product management of Onyx. "This independent certification validates that our 100 percent Internet-native architecture meets the highest standards for scalability, reliability and security. It delivers the high performance and low cost of ownership that our customers have come to expect from Onyx and is further proof that Onyx is well positioned to exploit the Microsoft .NET architecture."

Enterprise-Class Scalability
The Onyx solution has the proven ability to provide the largest, most complex organizations with the scalability they need to support growth on a global level and to enable business agility. In benchmark analysis performed under real-world laboratory conditions in the Microsoft Premier Support for Developers (PSfD) lab, the company achieved record-setting results for CRM applications, posting sub-second user response times for more than 30,000 concurrent users on a single four processor server.

Onyx Enterprise Application Server
The Onyx Enterprise Application Server provides a set of business and data services to the Onyx Enterprise 2001 thin-client browser applications Onyx Employee Portal, Onyx Customer Portal and the Onyx Partner Portal and custom or third-party applications that require access to CRM data and processes. It provides the following universal services:

• Performance and scalability services such as load balancing, application hosting services, performance monitoring and in-memory caching services
• Security services such as authentication, session management, role-based access control and secure, encrypted data transfer
• Customization and integration services such as a graphical design environment, personalization, version control, XML-based data exchange, distributed transaction management and globalization/ localization services

The Windows 2000 Server Family
The Windows 2000 Server family is targeted to meet these needs for businesses of all sizes, from small, centralized organizations to the largest distributed enterprise. Building on the strengths of Windows NT Server 4.0, Windows 2000 Server sets a new standard for how well an operating system can be integrated with standards-based directory, Web, application, network, file and print services, powerful end-to-end management and reliability, to provide the best foundation for integrating your business with the Internet.

About Onyx Software
Onyx Software Corp. (NASDAQ: ONXS) 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, Broadwing, Commerce One, Credit Suisse, Dreyfus, FirstWorld Communications, Portland Trail Blazers, Prudential Investments and Sierra Health Services. Get more information at 888-ASK-ONYX, 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 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 period 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 Telephone: 817.267.9686 Fax: 810.885.5291

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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