...neither of which come with the normal versions (and, indeed, are quite a bit more expensive), so most people will never even touch them on their PCs.
Though, I'll grant you, web development on OS X is really nice.
There is a 6 month trial of Windows Server http://www.microsoft.com/windowsserver2008/en/us/trial-softw...
Students can get a Windows Server licence for $19 http://blogs.msdn.com/b/gautam/archive/2010/02/18/msdnaa-sof...