Windows 10 use currently leads worldwide in terms of Windows desktop use.
Windows 7 with Extended Security Updates support fell out of support on Jan. 10. The same date as the end of supportfor Windows 8.1.
Both the Home and Pro Windows 10 OSes can’t be purchased from Microsoft after this month. Here’s Microsoft’s language to that effect from its Microsoft Store listings for the Home and Pro editions:
January 31, 2023 will be the last day this Windows 10 download is offered for sale. Windows 10 will remain supported with security updates that help protect your PC from viruses, spyware, and other malware until October 14, 2025.
A “get Windows 10” search currently defaults to Microsoft’s get Windows 11 page.
The statement seems to just apply to the downloadable OS product.
For the various ways to buy Windows, see this PCWorld.com article.