Windows 10 was used by 21.13% of all PCs worldwide in July 2016, according to the latest data from Net Applications. That's yet another big month-to-month increase compared to June's 19.14% and May's 18.43% share for the OS.

Windows 10

The new PC OS market share numbers showed Windows 7 staying in first place with 47.01% in July. Windows 10 is in second place, and Windows XP, which Microsoft no longer supports, still remains in third place with 10.34% in July.

Windows 8.1 is in fourth place with 7.80% in July. Windows 8, which Microsoft also no longer supports, had a PC OS share of 2.09% in July.