Microsoft is ending mainstream support for Windows 7 SP1, but you don't need to worry too much about it. Seeing the work the company is doing with Windows 10, will you consider upgrading to it?
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Windows 10 for PCs build 14352 released to the Fast ring
Despite announcing in July that mainstream support for Windows Phone 7.8 would end on September 9, Microsoft has quietly extended the cut-off date until mid-October, although it's not yet clear why.
Microsoft has confirmed that its mainstream support for Windows Phone 7.8 will end on September 9, 2014, which means that no further updates - other than security patches - will be made to the OS.