Alternate stats
W3Schools tells a different story. According to them, here are the differences between August and September;
Windows 10 went up from a 26.8% market share to 28%, a difference of 1.2%
Windows 8 went down from 12% to 11.4%, a difference of .6%
Windows 7 went down from 38.1% to 37%, a difference of 1.1%
Windows XP went down from 1.5% to 1.3%, a difference of .2%
Linux went down from 6.3% to 5.8%, a difference of .5%
Mac went up from 9.8% to 10.2%, a difference of .4%
Based on their average share between September and the rest of the year,;
Windows 10 average usage between January and September is 22.48%, up by 5.52%
Windows 8 average usage between January and September is 13.58%, down by (2.18)%
Windows 7 average usage between January and September is 40.74%, down by (3.47)%
Windows XP average usage between January and September is 1.71%, down by (.41)%
Linux average usage between January and September is 5.79%, up by .01%
Mac average usage between January and September is 10.16%, up by .04%
One interesting note to their figures, from January to August, Win NT* showed a market share of 0.1%, but for September showed 0.0%.
*NT includes all Windows Server operating systems (like Windows 2000, Windows Server 2003 and 2008).
The actual numbers I used may be found at (http://www.w3schools.com/browsers/browsers_os.asp)