As it does for each feature update, Microsoft has documented the features it’s removed and deprecated in Windows 10 version 2004.
“Each version of Windows 10 adds new features and functionality; occasionally we also remove features and functionality, often because we’ve added a better option,” a Microsoft support document related to deprecated features—that is, features that the firm is no longer developing and will later drop—notes.
Deprecated features include:
Companion Device Framework. The Companion Device Framework is no longer under active development.
Microsoft Edge. The legacy version of Microsoft Edge is no longer being developed.
Dynamic Disks. The Dynamic Disks feature is no longer being developed. This feature will be fully replaced by Storage Spaces in a future release.
Removed features include:
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.
Windows To Go. Windows To Go was announced as deprecated in Windows 10 version 1903 and is removed in this release.
Mobile Plans and Messaging apps. Both apps are still supported but are now distributed in a different way. [PC makers] can now include these apps in Windows images for cellular-enabled devices. The apps are removed for non-cellular devices.