eWEEK posted a pefomance article testing open source applications on Windows Server 2003 R2. The premise was to test peformance of open source technologies running on Windows vs Linux.

The Windows based stacks did very well in the tests overall leading to the conclusion that "Enterprise IT managers shouldn't hesitate to look into the option of deploying open-source stacks on a Windows Server platform."

It's mind boggling, however, that the only test off IIS 6 here is with Sharepoint. I would love to have seen Windows+IIS+PHP+MySQL vs LAMP in this test.

http://www.eweek.com/article2/0,1895,1983364,00.asp

-brett