I've begun the process of switch Rust's Windows CI to Server 2022, starting with the mingw builders: https://github.com/rust-lang/rust/pull/124562
This was tried a couple of years ago, but there some issues with mingw - so kudos to the folks that investigated and fixed those (sorry that I don't have links)!
Next step, the MSVC builders, which will require bumping the version of Clang that's used to build LLVM first...