El Reg reports
Microsoft may have used its Ignite conference to trumpet Windows 10 now running on 400 million devices, but the operating system's market share went backwards in September according to two of three traffic-watchers we track each month.
StatCounter Global Stats has Windows 10 at 24.42 per cent desktop OS market share for September, down just .01 per cent from its August share. Netmarketshare recorded a sharper dip, from August's 22.99 per cent to a September reading of 22.53 per cent.
[...] StatCounter has recently recorded a surge in "Unknown" desktop operating systems, [...] suggesting tracking and/or methodological issues.
We therefore checked out another useful source of data, [USA.gov]. When we crunched those numbers, we found Windows 10 accounted for 31.98 per cent of visits to US government sites in August and 32.48 per cent in September, which hardly suggests Microsoft's latest OS is rocketing up the charts.
[...] Our analysis of this data last month suggested Windows 10 has done very well at home, but is yet to crack the business market.
[Continues...]
Some things that occurred to me (with most being mentioned in the comments there):
(Score: 4, Interesting) by vux984 on Saturday October 08 2016, @09:10PM
Agree. I mean for all we know this is just 100s of 1000s of elementary, middle, and high school computers that weren't being used much over August few of which were upgraded over the summer, being fired back up in September. Plus kids are at home less, and at school more. Or as you said, straight up simply margin of error.
There really is no trend towards a previous version of windows or anything that I can see. People really aren't reversing the upgrade in droves or seeking alternatives to windows 10.