Windows 10 Usage Soars To Nearly 28% Of Steam Users
 

Personally, I think we will see this trend continue. Gamers in general like to upgrade to the latest software / hardware when they can and Windows 10 being free makes the choice that much easier. Thanks to fightingfi for the link. At the latest count, and to be exact, 27.64 percent of all Steam users are running Windows 10 in either 32 or 64bit form. This represents a near three percent growth in Windows 10 usage across October, and also shows the system cannibalizing a percent point from each of Windows 7 and Windows 8.1.

http://www.hardocp.com/news/2015/11/...8_steam_users/