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Windows 7 still gets support btw. You have to remember, the OS stops getting updates after they decide there is nothing else to update. Win 8 won't have an update for a long time if ever again.
I imagine one of the reasons they're pushing for everyone to move to Win10 other than the fact they're going to be pushing there own App store is the fact they want to shorten or end the length of support older OS's get.