Me too!! Just bought a Surface Laptop 7 as my daily business laptop. It's the first (successful) 'MacBook Air' attempt on Windows. I don't want to be in the claws of Apple. But that other giant refuses to support their own Exchange ActiveSync in Outlook on Windows 11. So, I am now a happy Thunderbird user. I can't wait for native support.
I was waiting for this for ages (and still am) but for those waiting with me: I just updated my old ARM PC (GalaxyBookS) to Win11 24H2 and Thunderbird (not ARM) runs A LOT smoother than it did before. So if this is the reason for you to wait as well - maybe give the new 24H2 update a try.
I can confirm the Windows ARM64 version is buildable, at least the "comm-release" repository.
In addition to standard Thunderbird build instructions, you need to add "ac_add_options --target=aarch64" to mozconfig and manually add rust toolchain by running "rustup target add aarch64-pc-windows-msvc" in mozilla-build shell.
I did encounter some strange issues with clang compiler though, clang would hang while compiling librnp unless I disabled optimizations (compiler bug?). It could just be my system though, I'm not sure.
An official release would be better though, since updating locally built release means I will have to incrementally rebuild it every time.
It is buildable for Windows ARM64. I did get it to build on my Windows 11 x86 build machine using the latest "-release" repositories (currently at 133.0.1) instead of "-central". In addition to the usual Thunderbird instructions, you need to add "ac_add_options --target=aarch64" to mozconfig and run "rustup target add aarch64-pc-windows-msvc" in mozilla-build shell.
There are some weird issues with clang-cl though, it hangs while compiling librnp unless optimizations are disabled (compiler bug?). It could just be my system though.