Clean Harbors Selects Onyx Software as Its Global CRM Standard
Premier Provider of Hazardous Waste Services Will Expand Its Use of Onyx to Power Internal Communications and Enhance Customer Experience

BELLEVUE, Wash. - Onyx® Software Corporation (NASDAQ: ONXS) worldwide leader in successful CRM, today announced that Clean Harbors, Inc. (Nasdaq: CLHB), the leading provider of hazardous waste services throughout North America, has extended its use of Onyx Software's customer relationship management (CRM) solution. The deployment is scheduled to reach 1500 employees throughout the United States, Puerto Rico, Canada and Mexico.

Clean Harbors is North America's largest provider of hazardous waste services, with more than 38,000 customers, including a majority of Fortune 500 companies, thousands of private entities and numerous government agencies. The company recently tripled in size to more than 4,400 employees as a result of its acquisition of Safety-Kleen Corp.'s Chemical Services Division (CSD).

"With the acquisition of CSD, our sales and service staff grew significantly. We needed a solid, dependable CRM solution that could be easily deployed to our new user base," said Michael Twohig, Vice President of Strategic Initiatives at Clean Harbors, Inc. "We are highly committed to customer success and strive to provide each customer with a smooth experience. Onyx Software's solution allows us to offer exactly that, which is why we confidently run our entire outfacing business on its technology."

The Onyx Software system in use by Clean Harbors offers a single digital workspace for employees to access critical client data, along with relevant information from other business applications. Built entirely on Internet technologies including XML, the solution is completely Web Services-based, integrates fully with other enterprise applications, and is designed with usability and cost-effectiveness in mind. The latest version includes support for Oracle database applications on various platforms.

Clean Harbors is integrating the Onyx Employee Portal (OEP) with internal systems at the company, including a finance solution and the Waste Information Network - an operational system created by Clean Harbors to handle all environmental safety, billing, regulatory, operations, field service and plant requirements.

OEP is the single customer-facing solution used by all of Clean Harbors' sales and customer service employees. Onyx is used for day-to-day business activities such as monitoring sales activities in the pipeline, tracking all customer interactions across multiple channels, generating sales reports, managing marketing campaigns, viewing contract pricing and invoicing, placing orders and administering sales budgets.

Clean Harbors is planning to implement follow on phases in the next year, which will include the additions of the Onyx Customer Portal (OCP) and Onyx Partner Portal (OPP). OCP will provide Clean Harbors with a personalizable, Web-based product that will enhance its ability to directly market to, sell to and service customers and prospects quickly and easily across all channels, strengthening relationships and boosting profitability. OPP offers a powerful, Web-based Partner Relationship Management (PRM) solution that will empower Clean Harbors to effectively collaborate with partners, rapidly capture opportunities, streamline sales efficiency, and ultimately increase loyalty and mutual profitability.

About Onyx Software
Onyx Software Corp. (Nasdaq: ONXS), worldwide leader in delivering successful CRM, offers a fast, cost-effective, usable solution that shares critical information among employees, customers and partners through three role-specific, Web services-based portals. The Onyx approach delivers real-world success by aligning CRM technology with business objectives, strategies and processes. Companies rely on Onyx across multiple departments to create a superior customer experience and a profitable bottom line. Onyx serves customers worldwide in a variety of industries, including financial services, healthcare, high technology and the public sector. Customers include Agile Software Corp., Credit Suisse, Delta Dental Plans of California and Pennsylvania, Dreyfus Corp., Fluke Networks Inc., Ingenix Health Intelligence, The Regence Group, The Seattle Mariners and Suncorp. More information can be found at (888) ASK-ONYX or info@onyx.com.

About Clean Harbors, Inc.
Clean Harbors, Inc. through its subsidiaries provides a wide range of environmental and waste management services to a diversified customer base including a majority of the Fortune 500 companies, thousands of smaller private entities and numerous governmental agencies. Within its international footprint, Clean Harbors has service and sales offices located in 40 states, Puerto Rico, Canada and Mexico, and operates 44 waste management facilities strategically located throughout North America. For more information, visit our Website at www.cleanharbors.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 annual report on form 10-Q for the period ended September 30, 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

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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