Windows 7, arguably Microsoft's best release of Windows, along with the less popular Windows 8.1 won't come installed on large OEM PCs after October 31, 2016. The move comes as Windows 7 rapidly excels towards its end of extended supported, which will occur at the beginning of 2020, having already lost mainstream support at the start of 2015. Just like each operating system has a date that it stops receiving updates, there is also an end-of-sale date, the date until when large OEMs can continue pre-installing a version of Windows. In the case of Windows 7, it was already meant to have stopped being pre-installed, but Microsoft allowed the Professional edition an additional two years until October 31, 2016. Now time has almost run out for both Windows 7 and 8.1 as their end-of-sale dates approach.