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Thunderbird add-ons that I've either used for years, or tested and highly suggest.
The add-ons included in this collection are all ones that are part of the messaging category on Mozilla Labs: https://mozillalabs.com/messaging/
Thunderbird 3: Install after upgrading
Collection of add-ons for getting your GMail through IMAP on Windows
BK's default thunderbird addons list
This is my TB add-ons which I see very helpful for office working.