IBM and Sun announced that IBM will distribute the Solaris operating system (OS) and Solaris Subscriptions for select x86-based IBM System x servers and Blade Center servers. Sun President and CEO, Jonathan Schwartz, and IBM Senior Vice President and Group Executive, Bill Zeitler, jointly presented the news during a press conference on August 16, 2007. This news follows Intel's endorsement of Solaris in January. Today, the Solaris OS is supported on more than 820 x86-based platforms and more than 3000 x86-based applications.Read more.
Also see Jonathan's blog entry on the announcement.