Please note: Due to various complications (such as an influx of dead links), this page is no longer updated or maintained. Visit the main page to reference the newest release of Mozilla Thunderbird.
The Mozilla FTP "server" automatically refers requests to one of a large number of mirrors to alleviate server loads. Lately, all Thunderbird releases prior to version 1.0 were withdrawn from many of the main servers. Thus, these versions may appear to be dead links more often than not.
If you need to download one of these software releases but cannot, the least I can do is suggest waiting a while and trying again. The link may refer you to a server that still carries it.
Alpha: Starting with the development of Thunderbird 1.1/1.5, the first interim software releases are given the Alpha designation. Many of the more significant or risky changes to software occur in the Alpha development stage. Several successive alpha software builds are released.
Beta: During this stage, new features and other significant changes are usually finalized while development shifts to bug fixing and stabilization before a final software release.
Release Candidate (RC): Recently, interim software releases have usually been released shortly before a final Thunderbird version is released. These versions, called Release Candidates, allow feedback to be collected from users for bug fixes and other improvements implemented in the final release of a given software version. I have not listed Release Candidates in the above chart, although they are sometimes visible on Mozilla.org's FTP server.
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