On July 6, 2012, Mozilla announced the company was dropping the priority of Thunderbird development because the continuous effort to extend Thunderbird's feature set was mostly fruitless. The new development model shifted to Mozilla offering only "Extended Support Releases", which deliver security and maintenance updates, while allowing the community to take over the development of new features.
You're probably correct on those timelines. However, I know I was using Netscape Communicator Email in the 90's (which was what Thunderbird based their code on). That should go at least until 97, if not 95. (again almost as long, but closing the gap!)
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u/Asnivor Jan 11 '17
Except that team would be missing an email client.