Microsoft's operating system runs on 90.85% of the computers identified by NetMarketShare, well ahead of the 7.54% for Mac OS and 1.61% for Linux.
Windows 7 is the most popular (60.98%), ahead of the newer version of the system, Windows 8.1 (13.2%) and, even more surprising, Windows XP (11.98%). In comparison, the most recent version of Mac OS X, Yosemite, is only running on 4.54% of the computers surveyed.
With the launch of the latest version of its operating system, Microsoft willtry to convince Windows 7 clients to upgrade to 10. To help accomplish this, Microsoft has already announced that for the first year, upgrades from Windows 7 and 8.1 to 10 will be free.
Windows 10 for PC and tablets will come out on July 29.