I read this and this.
Then I installed the Akonadi console:
root@tact:/home/jj5# apt-get install akonadiconsole
I opened it from K -> Applications -> Development -> Akonadi Management and Debugging Console.
Then in it I selected Agents -> Local Folders.
Then I changed: /home/jj5/.local/share/akonadi_maildir_resource_0 to my ‘important’ Thunderbird ImapMail directory.
I’m trying to figure out how to get my Thunderbird to use Maildir instead of Mbox so my backups are less data intensive.
I opened about:config via Edit -> Preferences -> Advanced -> Config Editor…
Then I changed “mail.serverDefaultStoreContractID” from “@mozilla.org/msgstore/berkeleystore;1” to “@mozilla.org/msgstore/maildirstore;1”.
Everything is easy when you know how!