Remember when Sun used to hate Microsoft? Apparently, neither does Sun, because in a joint announcement, Sun and Microsoft today revealed that Sun will sell Windows Server on their x64 hardware.

Just in case you weren’t convinced that Sun and Microsoft are BFFs, check out some of the quotes from the press release:

“Today’s announcement is another example of Microsoft’s commitment to 64-bit computing,” said Bob Muglia, senior vice president, Server and Tools Business at Microsoft. “The Sun hardware platform is an excellent foundation for Windows®-based enterprise solutions such as Microsoft Virtual Server, Microsoft SQL Server™, Microsoft Exchange Server and Microsoft Internet Protocol Television (IPTV) Edition. Our customers will have an additional choice of Windows Server OEM partners with Sun.”

“Sun is now a single source for today’s leading operating systems — Solaris and Windows — on the industry’s most innovative x64 systems and storage products. Customers can now take advantage of the virtualization benefits of Windows and Solaris on Sun’s energy-efficient x64 systems,” said John Fowler, executive vice president, Systems Group, Sun Microsystems. “Microsoft’s recognition of our x64 systems and storage is a testament to the superior system design at the heart of our product portfolio.”

In related news, Solaris 10 still exists. Just in case you forgot.