On 13 April 2010, Vista RTM will reach the end of support while same goes for Windows XP SP2 and Windows 2000 Professional on 13 July 2010, and Windows Server 2000 too. Note that Windows 2003 will be moved from Mainstream Support to Extended Support.
The end of support means that Microsoft will no longer provide anymore security updates for these versions. According to the software maker, this is in-line with their existing support lifecycle policy since 2002.
Users should take action prior to the end of support date to ensure they are secured with their Windows PCs.
http://vr-zone.com/articles/end-of-s...2000/8607.html