Betterbird. Simply better.
Betterbird is a fine-tuned version of Mozilla Thunderbird, Thunderbird on steroids, if you will.
Betterbird is better than Thunderbird in three ways: It contains new features exclusive to Betterbird, it contains bug fixes exclusive to Betterbird and it contains fixes that Thunderbird may ship at a later stage. Please refer to this feature table for examples. This should give you an impression of where the project is headed. More information on why we're doing the project can be found at the FAQ.
Betterbird 91.0 released on 5th August 2021
Today we are shipping the first release "bb8" of Betterbird version 91. In a successful beta period of Betterbird, we shipped the first beta release "bb1" on 12th July 2021, the last beta release "bb7" on 2nd August 2021. Please refer to the release notes for details.
Betterbird 91.3.2 released on 23rd November 2021
Today we are shipping Betterbird version 91.3.2-bb21. Please refer to the release notes for details. German localisation available, other languages on request.
For the much requested multi-line view, see here for details.