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CloseDeveloper reply by vaites
Rated 5 out of 5 stars
In the very last version of Thunderbird (currently in beta) the account list appears to be empty, so it is impossible to exclude accounts you don't want to be notified of.
5 stars for all the rest.
Solved in version 0.4.4
To create your own collections, you must have a Mozilla Add-ons account.