Janice P. Anderson
Chairman and Chief Executive Officer

June 6, 2006

Dear Valued Onyx Customer:

Today Onyx announced the signing of a definitive agreement to be acquired by the holding company of Made2Manage Systems Inc., a privately held enterprise software and services company, backed by considerable investment from Battery Ventures VI, L.P. and Thoma Cressey Equity Partners. Upon the closing of the transaction Onyx will operate as a distinct business unit within Made2Manage Systems, creating a stronger enterprise software company with greater scale and strategic scope to leverage across all its businesses.

We believe that the transaction is the right decision for our customers. Our new owners are committed to our customers' long-term interest and to Onyx's focus on mid and large enterprise-class businesses in the services industries. With the combined resources that will result from this transaction and the backing of our private equity partners, we firmly believe that we can and will continue to build our business, to strengthen our products and maintain our firm commitment to outstanding service to you and each and every one of our customers.

We expect the acquisition to be finalized during the third quarter of this year. Until then, it is business as usual at Onyx. I encourage you to continue to use existing contacts for customer service, support and sales. Our primary objective during the transition is to continue supporting your needs with superior customer service and support, and to ensure that you remain the focus of our attention.

In the coming weeks, our energy and resources will focus on making this transition as seamless as possible. We appreciate your trust and we will continue to work hard to earn your business. As always, if you have questions or concerns, please do not hesitate to contact me directly at jpanderson@onyx.com or (425) 519-4100. The entire team here at Onyx looks forward to continuing to serve you under our new ownership.

Best Regards,