Microsoft has chosen exactly the same date to stop selling Windows 8.1 while it will urge its OEM's to stop selling Windows 8 starting from June 30 2016. Until now Microsoft  set October 31 2014 as the end of sales for new consumer-grade Windows 7 PCs, but for now has left open the do-not-sell-after-this-date for business machines which have the Windows PRO handle. 

Windows 7 has been with us since October 22 2009, or six years ago. Microsoft will give it one more year and then the Windows 7, the one that was codenamed Vienna will mean nothing to us. Until that time, or roughly a year from today OEM partners will still be able to sell Windows 7 powered machines.

Windows 7 will still be supported unitl 2020, so there is plenty of life in this operating system.  Windows 8 will receive support at least until 2023. Many business users still prefer Windows 7 to rather new Windows 10. ATMs around the world use to run Windows XP and just got the update to a "newer" version of Windows.