Thoughts from the EPS Windows Server Performance Team
It has been a few years and it is almost time to end support for Windows Vista SP1. On July 12th, 2011 Windows Vista SP1 will no longer be receiving support. This means assisted support and even security updates. This does not mean that we are stopping support for Windows Vista in general, just Windows Vista with SP1. Windows Vista with SP2 is of course still supported and will continue to receive assisted support and security updates.
The following links contain more information on this subject:
Windows End of Support Information - Windows Help & How-to Windows 7 Upgrade Advisor Learn how to install Windows Vista Service Pack 2 (SP2) What's included in Windows Vista Service Pack 2 (SP2)
Also note that Windows Server 2008 RTM (it shipped with SP1 integrated) will be going out of support July 12 2011 as well. After July 12, 2011 you will have to have SP2 installed to be supported (just like Vista).