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I'd amend the Best Server OS category to read "Best Server OS for someone who doesn't know how to run a server", and then you can definetly name Win 2K3 the winner.
And no, I'm not going to say it's Linux either. But clearly, Solaris or AIX would walk all over Win2K3 in most aspects. Try running a high load oracle cluster on Win2K3 and see how it compares to AIX or Solaris.