Hello,
how does this effect existing apps in store.
It depends on the Apple and Google's store policy.
From Xamarin Support Policy, Android 13 and Xcode 14 SDKs (iOS and iPadOS 16, macOS 13) will be the final versions Xamarin will target. Your apps in the store can support up Android 13 and iOS 16.
As noted in Apple's announce- as of April 2024 all iOS and iPadOS apps submitted to the App Store must be built with a minimum of Xcode 15 and the iOS 17 SDK.
(Apple did not mention that they will remove the existing apps that only support iOS 16 and the new version apps should comply with the iOS17 policy)
For Android, the app must target Android 13 (API level 33) or higher and your app complies with the policy, see Target API level requirements for Google Play apps - Play Console Help
The biggest effect is that the users might upgrade the OS on their devices but your app doesn't support it. For upgrading to MAUI, please see Upgrade from Xamarin to .NET - .NET MAUI | Microsoft Learn
Best Regards,
Wenyan Zhang
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