Microsoft has published details on how developers can migrate existing UWP apps to the Windows App SDK (Project Reunion), which keeps the classic Win32 platform at the center of the corner. This can be useful if your app requires features and APIs that are not available in the UWP platform but are available in the Windows App SDK.
According to Microsoft, it still supports UWP apps, so developers can decide which platform to use for a new project. So, if you are satisfied with the current functionality of the UWP, then there is no need to switch to a different project type. Also, Windows will continue to use UWP for built-in apps.
If you are a UWP application developer and want to use the latest developments in WinUI 3 and .NET 5/6 (and newer versions), then you need to port your project to the Windows App SDK. Going forward, the UWP platform will only receive bug fixes and security improvements, and will not have access to new APIs.
In fact, this indicates that the UWP platform is now deprecated, similar to what happened to WinForms in the .NET Framework.
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