Over time Mozilla’s Thunderbird may happen to require some maintenance in order to continue running smoothly. Symptoms could be that either you cannot find mails that are supposed to be there, mails are doubling without any reason, or deleted mails show up again in its original folder.
Note that Thunderbird must be closed (and really not running) for the next steps to be successful. You then need to navigate to your profile folder and execute the given commands at the root of this directory.
Governments of the Industrial World, you weary giants of flesh and steel, I come from Cyberspace, the new home of Mind. On behalf of the future, I ask you of the past to leave us alone. You are not welcome among us. You have no sovereignty where we gather.
We have no elected government, nor are we likely to have one, so I address you with no greater authority than that with which liberty itself always speaks. I declare the global social space we are building to be naturally independent of the tyrannies you seek to impose on us. You have no moral right to rule us nor do you possess any methods of enforcement we have true reason to fear.