BELLEVUE, Wash. - Onyx® Software Corporation (NASDAQ: ONXS) a global supplier of customer relationship management (CRM) enterprise applications, today announced that it ranked Number 409 on the 2001 Deloitte & Touche Technology Fast 500, a ranking of the 500 fastest growing technology companies in North America. Rankings are based on five-year percentage revenue growth from 1996 - 2000. Onyx grew 1,160 percent during this period.

Onyx CEO, Brent Frei, attributed Onyx's revenue growth over the last five years to the company's intense focus on customer success. He said, "Our customers derive real business benefits from their Onyx software. They rely on our Internet-native technology platform to deliver faster time-to-benefit and lower total costs of ownership than they would otherwise achieve with many other CRM vendors."

"Making the Deloitte & Touche Technology Fast 500 is a testament to a company's leadership, commitment to technology, and ability to deliver the right solution at the right time," said Mark A. Evans, managing director - Deloitte & Touche Technology & Communications Group. "With its 1,160 percent five-year growth rate, Onyx has proven that its leadership has the vision and determination to succeed, and we at Deloitte & Touche salute their accomplishments."

In addition to ranking on the Deloitte & Touche Technology Fast 500, Onyx ranked 19th on the Washington State Technology Fast 50, which is a ranking of the 50 fastest growing technology firms in Washington State.

The Fast 500 list is compiled from three sources: winners of Deloitte & Touche's 22 regional North American Fast 50 programs, nominations submitted directly to the Fast 500, and public company database research. To qualify for the Fast 500, entrants must have had 1996 revenues of at least $50,000 USD and $75,000 CD for the United States and Canada, respectively. Entrants are public or private companies headquartered in North America and must be a "technology company," defined as a company that develops proprietary technology which contributes to a significant portion of the company's operating revenues, manufactures a technology-related product, or devotes a high percentage of effort to research and development of technology.

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 The Regence Group. Get more information at 888-ASK-ONYX or info@onyx.com.

About Deloitte & Touche
Deloitte & Touche LLP, one of the nation's leading professional services firms, provides assurance and advisory, tax and management consulting services through nearly 30,000 people in more than 100 U.S. cities. The firm is dedicated to helping our clients and our people excel. Known as an employer of choice for innovative human resources programs, Deloitte & Touche has been recognized as one of the "100 Best Companies to Work For in America" by Fortune magazine for four consecutive years. Deloitte & Touche is the U.S. national practice of Deloitte Touche Tohmatsu. Deloitte Touche Tohmatsu is a Swiss Verein, and each of its national practices is a separate and independent legal entity. For more information, please visit Deloitte & Touche's web site at www.us.deloitte.com.

About Deloitte & Touche's Technology & Communications Group
The Technology & Communications Group is composed of service professionals who have a wealth of experience serving technology and communications companies throughout the world in areas including Internet, software, semiconductors, cable, media and publishing, communications utilities, networking, wireless, computers and peripherals, and related industries. These specialists understand the challenges that technology and communications companies face throughout all stages of their business growth cycle and are committed to helping them succeed. Deloitte & Touche is a leader in providing strategic, financial, operational, and information technology assistance to its technology and communications clients.

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.

Onyx is a registered trademark of Onyx Software Corporation in the United States and other countries.

Contact:

Bob Craig Onyx Software 617-314-6846

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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