https://www.bleepingcomputer.com/news/microsoft/windows-10-gains-ground-in-enterprise-environments-while-windows-7-crashes-out/

Statistics gathered from over 11 million enterprise users reveal that Windows 10 market share is growing, Windows 7 has been slowly phased out, and, unfortunately, a large number of users are still using outdated operating systems.

This statistical data was gathered by Duo Security, a cyber-security firm, and provider of secure login/access solutions, and compiled in the company's yearly Trusted Access Report.