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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. You can install Betterbird at the same time as Thunderbird and run them on the same profile. That means that you can try out Betterbird with zero hassle, and go back to Thunderbird if you don't like it - which is unlikely.

Betterbird aims at providing a better user experience by fixing annoying bugs in Thunderbird and implementing new features. A big improvement was the implementation of the much-requested multi-line view. A decent system tray ("systray") tooltip showing new messages and their folders. Also avaialble on Linux, it helps people who filter mail into many folders. Users can simultaneously work with multiple accounts, manage their mail by responding, forwarding, and tagging.