Also:

* Windows POSIX Subsystem: WSL has similar features, but not exact what the POSIX Subsystem is.

* Windows OS / 2 Subsystem: Killed.

* Multipoint Server: Killed in server 2016.

* Hyper-V RemoteFX

* WDS boot.wim deployment: Killed in server 2022 and Windows 11, although MDT provides a much better solution.

* TFS: MS wants you to use Azure DevOps.

* Hyper-V Server: The free ESXi alternative. MS wants you to use Azure, so it is killed with the release of server 2022.

* Microsoft Security Essentials: Killed in Jan. 2020, and its signature updates will stop in 2023.

* Windows CE: Replaced by Windows IoT

* Aero: Such a beautiful effect. Killed in Windows 8.