The best replacement for server 2003 is xp.

The best alternatives to server 2003 are rated as following:

★★★★★	xp
★★★★	windows xp
★★★	windows server 2008
★★	server 2008
★★	server 2003 r2
★★	xp pro
★★	r2
★	xp professional
★	server 2003
★	small business server
★	2003r2
★	home server
★	netware 6.5
★	server 2000
★	sbs 2003
	novell netware
	linux server
	windows server 2003 r2
	windows server 2003
	windows server 2000
	ubuntu server
	2003 r2
	linux ubuntu
	windows home server
	windows xp pro

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Speaking about server 2003, one probably shouldn't forget about vista workstation.

Other search terms related to server 2003 and their ratings are:

★★★★★

vista workstation

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server 2003

windows xp