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I'd have to disagree with the "Best Server OS" choice here. Windows 2003 is simply not it. Although new in 2003 and that might well have been the reason for being chosen here by Eugenia, but it is by no means the "Best Server OS" for 2003 or any other year, for that matter.
My favorite OS and server OS of choice is FreeBSD, but here I'll have to choose Linux. Linux 2.6 is very promising and it also came out in 2003.