On January 13, 2015, Microsoft will stop mainstream support for Windows 7–which is still an extremely popular operating system. But you’ll still be able to use it safely for another five years.
Once mainstream support ends, there will be no more service packs. Microsoft won’t redesign the environment or add new features. Without a special extended agreement, you won’t get patches for bugs that don’t result in a security threat.
Vista mainstream support ended on April 10, 2012. Extended support will end on April 11, 2017, so you can continue to use Vista for another two and a half years plus.
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Feeling Lucky – Windows Seven | Microsoft’s Operating System Windows Seven Service Pack One