Just released are the details about features and functionalities that were removed in Windows 10 (version 2004).
The list below provided via the Microsoft post is subject to change and might not include every affected feature or functionality.
|Feature||Details and mitigation||Removed in version|
|Cortana||Cortana has been updated and enhanced in the Windows 10 May 2020 Update. With these changes, some previously available consumer skills such as music, connected home, and other non-Microsoft skills are no longer available.||2004|
|Windows To Go||Windows To Go was announced as deprecated in Windows 10, version 1903 and is removed in this release.||2004|
|Mobile Plans and Messaging apps||Both apps are still supported, but are now distributed in a different way. OEMs can now include these apps in Windows images for cellular enabled devices. The apps are removed for non-cellular devices.||2004|
You can read the full post to see the features that were removed from versions 1909, 1903, and 1809, and prior releases.
There are also features listed via another update that Microsoft is no longer developing (depreciated features):
|Feature||Details and mitigation||Announced in version|
|Companion Device Framework||The Companion Device Framework is no longer under active development.||2004|
|Microsoft Edge||The legacy version of Microsoft Edge is no longer being developed.||2004|
|Dynamic Disks||The Dynamic Disks feature is no longer being developed. This feature will be fully replaced by Storage Spaces in a future release.||2004|