Net Applications' data for September shows that Windows 7 is still number one in OS market share with 46.43 percent, up from 45.63 percent in August. Windows 8 is third with 8.02 percent, a gain compared to August's 7.41 percent but not nearly as much as Windows 8 gained from July to August, where it went up over two percentage points.
Windows 8.1, which was made available as a preview version in June by Microsoft, is listed at holding 0.87 percent of the OS market share by Net Applications for September, compared to 0.24 percent in August. Windows 8.1 will officially launch on October 18th.
Source: Neowin