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od hovel dne Bře. 23, 2015 · trvalý odkaz

This is the extension i was looking for. Unfortunately I cannot use it because:
It does not work between IMAP and LOCAL folders. All emails are marked as new!
When an email message is stored in a local folder Thunderbird adds some extra control records. (x-mozilla....). Copy Folders should ignore these records when comparing IMAP and LOCAL folders.