https://www.zdnet.com/blog/microsoft/its-the-end-of-mainstream-support-for-windows-vista/12370
On April 10, 2012 — a k a, tomorrow — Windows Vista’s period of free, Microsoft-provided mainstream support comes to an end.
What’s that mean to users still running one of Microsoft’s least publicly popular versions of Windows?
If you ask Microsoft, officials there will likely tell you that the end of mainstream support means it’s the ideal time to upgrade to Windows 7. But in reality, there are still a number of years left — five, to be exact — before Extended Support for Vista ends. That date is April 11, 2017, for all versions of Vista.
Interestingly, Windows XP, which Microsoft introduced in 2001 (six years before it launched Vista), doesn’t exit the Extended Support phase until 2014 (for XP with Service Pack 3). But XP still has considerably more market share than Vista.
As Computerworld noted, Microsoft also is moving Office 2007 into the Extended Support phase this week (today, April 9, to be precise).