Windows 10 claimed 5.21% of the total worldwide PC operating system market share for its first full month of release in August, but September's numbers showed only a slight increase to 6.63% for Microsoft's latest OS version. The numbers were revealed today by research firm Net Applications, who monitors stats from tens of thousands of websites.

Windows 10 is still in fourth place among all PC operating systems worldwide, according to Net Applications. Windows 7 still has a solid lock on the number one spot with 56.53% in September, down from 57.67% in August. Windows XP, which Microsoft no longer supports, was still listed in second in September with 12.21%, up very slightly from August, when it had 12.14%. Windows 8.1 was third in September with 10.72%, down from August with 11.39%.

Microsoft has already announced that Windows 10 has been installed on over 75 million PCs and tablets in the first four weeks since it launched. Unconfirmed reports claim that number has now increased to over 100 million installs.

Source: Net Applications