Download Mozilla Earlybird – Alpha Build of Thunderbird
Earlybird is Mozilla’s alpha build of Thunderbird. It’s the Thunderbird equivalent of Firefox Aurora, and like Aurora, installs alongside an existing stable or beta build of Thunderbird, allowing you to run this early developmental version side-by-side with your existing version. You can run it alongside Thunderbird, it does share the same settings and data files, which means you should back up your email (using MozBackup) when using it.
It’s possible that if certain features prove too troublesome during that testing period that they’ll be held back to a future release, meaning you could find yourself using features that may not appear in the subsequent Beta version if they can’t be made stable enough for the next phase of development.
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