Out of all the Operating Systems that are currently available, Windows 10 is now
the second most popular OS installed, at 11.85% of the Internet using it according to Net Market Share. The number one is still Windows 7 at 52.47%. It appears that many businesses are slow to upgrade to Windows 10 due to the familiarity of Windows 7.
This goes to show you that offering Windows 10 as a free upgrade was in fact a good marketing technique.