Hello Garuda users extraordinaire. Thunderbird has an update which....drum roll, afterwards moves or utilizes a new folder, hence breaking the link from your old Thunderbird profile/account stuff. Basically, you will see a blank Thunderbird with a setup screen upon reboot.
The old T-bird profile was located in your home directory as = .thunderbird
The new profile is located under = .mozilla (along with firefox's profile)
To fix this issue, there is a handy import tool inside Thunderbird (Tools/Import) that you can select your old profile in .thunderbird and it will import everything where it should in .mozilla.
Thank you, and this
Walter Cronkite, me, signing off.