Microsoft support for Windows Vista Service Pack 1 (SP1) will end on July 12, 2011. From that date onward, Microsoft will no longer provide support or free security updates for Windows Vista Service Pack 1 (SP1).
Windows Vista Authorized Replication Ends October 11, 2011
This date is two years after the General Availability (GA) of Windows 7. Going forward all Windows products will follow a standardized End of Sales schedule which sets the End of Sales date for the previous Windows version at the start of the General Availability (GA) of the new Windows version. Once the new Windows Operating System (OS) reaches the set GA date, the previous version will remain available for two years after this date.