Windows XP is Microsoft’s longest living operating system to date. Released in October 2001, it succeeded the total failure that was Windows Millennium Edition, and has, in turn, been succeeded by Windows Vista. Service Pack 3 is, as implied by the name, the third major upgrade package – Service Pack – released for Windows XP. Unlike SP2, SP3 contains no changes that are directly experienced by the end-user. SP3 was released for download on May 6th, 2008.