In its May Dev Digest post, the @thunderbird team has announced that they're “very very very close” to achieving Microsoft Exchange support. The upcoming beta version 128 will also feature Rust-enabled builds by default, Linux system tray support, and more.
https://alternativeto.net/news/2024/5/the-thunderbird-team-says-it-s-very-close-to-achieving-full-microsoft-exchange-support/