Anyone ever used Windows Server 2003 or 2008? 21th century equivalents for the magnificent Windows 2000. Fast, simple, robust and native 64 bit support (Unlike the travesty that Windows XP 64bit was).
Windows 2003 and 2008 were the last vast superior server OS from Microsoft that was actually useful for use in desktop in contrast with their respective client version (xp and vista).
2003 is nt 5.2 and was considerably faster than XP (nt 5.1) ever could be, I used server 2003 until 2007, but I think its futile to advocate its use because people still too much 'hur dur its a server OS', they can't realize its superiority.
2008 was very strange it had the same kernel as Vista but in my benchmarks it was about 10-15% faster than Vista, I only heard some theories like the removal of DRM responsible for such better performance.
from 2008r2 and 2012 no real gain is observed in comparison with the client version (7 and 8).