Microsoft announced back in October that Windows 10 had surpassed 110 million installations worldwide, which for October was an impressive achievement. But that was over 3 months ago, and since 2015 is coming to a close, we thought now was probably a good time to check in on that install count. Last time I checked, 120 million was the number.
According to my contacts, Windows 10 has now been installed on over 200 million devices worldwide...
Read more: As 2015 comes to a close, Windows 10 surpasses 200 million installs WinBeta
See also: Windows 10 Now Active on over 200 Million Devices | Windows Experience Blog