.NET Framework 3.5 images for Windows Server 2025 will no longer be published after May 13th

> This issue is a locked mirror of https://github.com/microsoft/dotnet-framework-docker/discussions/1228.

We have been publishing Windows container images for .NET Framework 3.5 and 4.x since 2016. We recently reviewed pull usage for .NET Framework 3.5 images (across all Windows Server versions) and found that it is low. We plan to stop producing (and no longer document) the `3.5` tag for Server 2025 before it gets significant usage. We only [recently added support for Windows Server 2025](https://github.com/microsoft/dotnet-framework-docker/pull/1183). We will not be publishing .NET Framework 3.5 images for Windows Server 2025+ going forward.

We plan to stop producing .NET Framework 3.5 tags for Windows Server 2025 on May 13th.

Windows Server 2025 tags for .NET Framework 3.5 look like the following:

```
3.5-20250211-windowsservercore-ltsc2025, 3.5-windowsservercore-ltsc2025, 3.5
```

Documentation for installing .NET Framework 3.5 is provided here: [How to install .NET Framework 3.5 on Windows Server Core container images](https://github.com/microsoft/dotnet-framework-docker/blob/main/documentation/install-netfx3.md).

We are currently considering opportunities to consolidate 4.x images. We may have a follow-on notice about those images.