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Windows XP will not be available after.. June 30, 2008

Microsoft will end mainstream support (updates) for XP on April 14, 2009, for most editions, and it will end extended support on April 8, 2014 for most editions. (Extended support is not available for consumer licenses.) Both support mechanisms include free security updates. Hot fixes for other issues are free only during the mainstream support period; non-consumer users wanting hot fixes must buy a hot-fix update plan from Microsoft before July 14, 2009.

Ref...
http://www.infoworld.com/article/08/01/28/04NF-save-xp-license_1.html