Mozilla Thunderbird - take over profile new computer?

I have installed Mozilla Thunderbird on my PC and everything works fine.

Since a notebook has now been added and I don't want to set up the program from scratch, I copied the "Thunderbird" folder from the% appdata% directory on the PC and replaced it with the newly created one on the notebook.

When I start Thunderbird for the first time, everything fits, both e-mail accounts are listed with the subordinates and all mails.

However, if I close Thunderbird and restart it, then only the two e-mail accounts are displayed without the sub-folders and e-mails.

Why is that? Incidentally, a lock symbol is displayed for both accounts. Is this possibly related to this?

As soon as I replace the Thunderbird folder with the one on the PC, everything works again - until I restart the program. The lock symbol is already displayed there.

Have you already looked here?

https://support.mozilla.org/...ebertragen

Have imap? With pop3 I could imagine the behavior.