Although Microsoft still hasn't updated its "400 million devices running Windows 10" statement since September 2016, it appears that the company's latest operating system is making its way to more machines. The latest report from NetMarketShare indicates that the OS is now installed on over 25% of all devices.
According to the report, Windows 10 now holds a market share of 25.36% - up from the 24.36% that was cited last month. In contrast, Windows 7 finally seems to be losing some market share; the OS is now being used on 47.20% of machines, which is slightly lesser than the 48.34% reported last month. Meanwhile, Windows XP refuses to die, and has climbed to a market share of 9.17%. However, seeing that this is a 0.1 percentage point increase over the previous month, it is well within the margin of error.
Windows 8.1 market share remained stagnant at 6.90%, whereas "Mac OS X" 10.12 climbed from 2.31% to 2.75%. Version 10.11 of the operating system showed a healthy 1.73% market share, with Linux slightly ahead at 2.27%. Meanwhile, the "Others" section showed a decline from 9.02% last month to 8.68% now.
To put it in perspective, Windows 10 was at 11.85% market share at the same time last year, which is a ~114% YoY increase. That said, the report's data is derived by aggregating the traffic across NetMarketShare's network of websites that use its service, so it may not be an entirely accurate depiction of each OS' market share.
Update: An earlier version of this article incorrectly stated that Windows 10 has seen a 214% YoY increase. This has now been updated to reflect that while the OS is 214% YoY, this is an increase of 114%. We apologize for the oversight.