Thunderbird 154.0 adds system tray mode, macOS previews, and Microsoft 365 updates

Thunderbird 154.0 introduces an optional system tray mode, allowing users to hide the app when the last window is closed.

This release adds attachment preview support for macOS and enables Microsoft Graph for Microsoft 365 accounts.

Important security patches and multiple crash fixes addressing IMAP, EWS, and message handling have also been included.