Windows 7 's market share increased to less than 45 % of desktop operating systems as of December 2017 .
In just six months , over 100 million copies had been sold worldwide , increasing to over 630 million licenses by July 2012 , and a market share of 47.21 % of `` desktop operating systems '' as of September 2017 according to Net Applications , making it the most widely used version of Windows ( while Windows 10 is now more popular in Europe and North America ) .
Windows 7