Windows CE

Windows CE (also known officially as Windows Embedded Compact post version 6.0, and sometimes abbreviated WinCE) is Microsoft's operating system for embedded devices and minimal computers. Windows CE is a different operating system and kernel. It is not a trimmed-down version of desktop Windows. It is not Windows XP Embedded which is NT-based.
The Zune portable media player, as well as the Windows Mobile and Windows Phone 7 smartphone platforms are based on Windows CE.
Version 8, or Windows Embedded Compact 2013, released in June 2013 as of 2022 is the only still supported version (until October 10, 2023). However, since October 9, 2018, when Windows Embedded Compact 2013 reached the end of mainstream support, that was the end of mainstream support for Windows CE evolution.