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It existed before that and was called Minotaur, which was a work to separate the mail client from the Mozilla suite. Thunderbird wasn't written from scratch from Phoenix or firebird. But it benefited of all the improvements made to common code used by Phoenix if memory serves right.

The pre-1.0 releases were functional (they were derived from the Mozilla App Suite) and relatively popular. I used Thunderbird 0.2, which Wikipedia says would have been in 2003.

I've always thought of a time machine as being capable of traversing time but not rearranging it.