Microsoft will continue to support .NET Framework 4.6 on Windows 10 Enterprise LTSC 2015 until October 2025, when the OS reaches EOL. Additionally, other .NET framework versions will continue to be supported according to the official lifecycle map, the announcement mentions.
What happens if my .NET Framework version is deprecated?
Technically, devices can still use the outdated .NET Framework versions. However, they will be exposed to security threats. Moreover, if technical support is needed for whatever reasons and the framework is out of date, the first request will be to upgrade it. The grace period to upgrade from .NET Framework versions 4.5.2, 4.6, or 4.6.1 to at least .NET Framework 4.6.2 to still get updates is May 2022. Additionally, Microsoft mentions that after April 26th devices can still use the old frameworks, but they won’t receive any updates or security patches. The decision to cut support for the mentioned framework versions is that they use insecure digital certificates. On the other hand, according to Microsoft research, the vast majority of users are eligible to upgrade to (or already use) newer framework versions and have safer digital certificates. If an organization has automatic upgrades activated, it’s possible that the .NET Framework is already up-to-date and in this case, no further action on the admins’ side is necessary. Also, if .NET Framework 4.6.2 isn’t already in place, admins only need to update the runtime on which the app is running. Using the official guide for application compatibility in the .NET Framework is highly recommended. If an app isn’t compatible with newer .NET Framework versions, some code changes have to be performed in Visual Studio, as shown in the official documentation.
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