Am Sonntag, den 23.08.2015, 20:36 +0200 schrieb Mogens Melander: > For a task like this, I would use imapsync, a well documented, > well supported and open source tool. > > https://github.com/imapsync/imapsync I've used imapsync to migrate an internal server from 2.1.18 to 2.4.17 without any problems. Good tool. Ciao!