I migrated my mailserver from an Ubuntu based VPS to a NethServer7 based VPS and used imapsync to move all the mails.
I installed imapsync on the ‘old’ server and moved all mail data to the new (NethServer) server. Quite straighforward.
Some more info in our wiki: https://wiki.nethserver.org/doku.php?id=imapsync&s[]=imapsync
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