Windows 10 Mobile
Windows 10 Mobile came out on March 17, 2016. It was released shortly after Windows 10 for computers, which came out on July 29, 2015. In October 2017, Microsoft stopped active development of Windows 10 Mobile, except for security updates, because few people were using it.  Microsoft ceased providing security updates on January 14, 2020, the same day as for Windows 7.