It might be only a matter of time before every version of Windows prior to Windows 10 barely registers a blip on the radar, but in the here and now, that is not the case. Windows 7 is still widely deployed. What’s more interesting is that even though Windows 10 has been steadily growing its share of the OS market since it came out in July

Source: Hot Hardware – Microsoft Analysis Shows Windows 7 Gaining Small Slice Of Market Share From Windows 10