HP sold their OpenMail server to Samsung. This server product does all that a Microsoft Exchange server does, at a fraction of the cost, and with much higher security an reliability running on Unix platforms.
http://serverwatch.internet.com/news/2002_05_20_a.html When Hewlett-Packard announced last year that it was discontinuing development of OpenMail, its popular electronic-mail and messaging application, there was a outcry from Linux system administrators, as OpenMail was one of the most popular tools for managing corporate email on the Linux platform. So instead of killing OpenMail outright, Hewlett-Packard went to the extraordinary step of seeking a buyer for OpenMail, so the product would continue to be maintained. As a result, Samsung licensed OpenMail and is now offering it under the Samsung Contact 7.1 moniker, with Linux, HP-UX, Solaris and AIX versions. ... According to Samsung, a key reason to adopt Samsung Contact is its support of Microsoft Outlook, both on the server and client sides. Samsung Contact on a server directly supports most features needed by the Microsoft Outlook Windows-based desktop client, including calendaring, scheduling, delegation and offline synchronisation. (read more in the article)
