Windows XP is a client-side version of Windows that first became available in 2001 and the last Service Pack update for Windows XP was Service Pack 3, which was released in 2008.
The two versions of Windows before Windows XP were Windows 2000 and Windows Me. The next version of Windows after Windows XP was Windows Vista, which was released in 2006.
Microsoft stopped mainstream support of Windows XP in 2011.
