I can't log in. Account looks like it disappeared. It keeps telling me to set up an account but I've been using it for many years. All is lost.
I restarted laptop & could not access Thunderbird email. It keeps wanting me to set up an account.
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For whatever reason Thunderbird forgot about the existence of your profile. Follow the instructions on how to move a profile. This will tell Thunderbird again where your profile is stored. http://kb.mozillazine.org/Moving_your_profile_folder_-_Thunderbird#Use_the_Profile_Manager_to_move_your_profile
For more information about the profile location see http://kb.mozillazine.org/Profile_folder_-_Thunderbird
If the 'disappearance' happened after a TB update, you might be able to restore it by deleting the global search sqlite file:
https://support.mozilla.org/en-US/questions/1276755#answer-1281884