Thunderbird moves mails and mail folders without request by drag and drop.
This can happen by accident, if a user clicks on a mail folder and moves the mouse a little (using a bad mouse, or reading mails on a train...).
Once Thunderbird started to move a folder with a few thousand mails it can not be stopped.
What can the user do to prevent this? Is there a plugin that raises a last warning before moving? Is there any way to monitor and undo the movements?