You may be aware that the firm acquired another client K-9 Mail but it wasn’t clear how that would eventually evolve or result in a dedicated client for Thunderbird.

One of the primary changes Thunderbird developers are currently working on is support for Microsoft Exchange, the popular mail server and calendaring platform designed to run exclusively on ...

But for many users, the name Outlook is synonymous with an overloaded, cumbersome, and unwieldy application. This is where Thunderbird 115 comes in handy: The new edition of the open-source mail ...

The Thunderbird app is based on the well-known open-source client K-9 Mail. Work has been underway since 2022 to merge K-9 into an Android version of Thunderbird.

Thunderbird for iOS is not the only construction site at Mozilla. At the end of March 2025, the company announced that it would be introducing paid services, including its own mail provider ...

Mozilla has released version 5 of Thunderbird, the popular open source e-mail client. The update includes some new features, updated components under the hood, and a number of performance and ...

Thunderbird is an open-source email client developed by Mozilla The app has been available on Linux and other platforms for ages and been in development since the early 2000s, but has never made ...

Thunderbird will be coming to Android through the popular open source mobile email client K-9 Mail. According to Thunderbird's Jason Evangelho, the Thunderbird team has acquired the source code ...

Thunderbird does permit you to add color-coded tags, à la Mail and Outlook’s flags, to individual messages. You can change the names of the five default tags, or create new ones.