Microsoft has opened preorders for Windows 8.1, the update coming later in October that's designed to make it easier for people to absorb the radical new interface that arrived with Windows 8.
The software maker will automatically upgrade Windows 8 machines on October 17, the day before Windows 8.1 ships, but now Windows 7 users can pay $120 to order the Windows 8.1 upgrade DVD or a digital download.
Read more at: Microsoft opens Windows 8.1 preorders before Oct. 18 launch | Microsoft - CNET News
See also: Buy Windows 8.1 - Microsoft Store