The wait is (almost) finally over. The Thunderbird team has confirmed that Exchange email support will be officially introduced in version 144, scheduled for release in October 2025.
And let me tell you, this could be a real turning point for this email client. It’s finally opening the door to the business segment—a space long dominated by Microsoft Outlook and its built-in Exchange Server capabilities.
The new support includes undo and redo operations for move, copy, and delete actions, as well as notifications, basic search, folder repair, and remote content handling. Users will also notice status bar feedback messages, updated account settings, and an autosync manager to handle message downloads more efficiently.
Attachment management has also been improved with delete and detach options now built in.
Advanced server settings have also begun to roll out, providing admins and power users with more flexibility in complex environments. Early adopters are also testing experimental tenant-specific configuration options, currently hidden behind preferences.
According to devs, the QA team is currently running extensive test plans with the help of a small beta group, and the results will guide the documentation and support expected with the October rollout. Looking further ahead, the developers are already planning enhancements, including folder quotas, improved search, and support for calendar and address book integration through Exchange Web Services.
While the spotlight is on Exchange, Thunderbird’s development continues in other areas, too. A dedicated “Conversation View Work Week” recently produced working prototypes of a Gmail-style threaded view, and progress has resumed on the long-stalled calendar UI rewrite.
For more information, refer to the official announcement.
