Migrate from W2008R2/Exchange 2010 to Nethserver/WebTop

[mahaq (Mats)]

@robb

Maybe a bit late but did you try using imapsync? I found a post where is claimed it actually works to use imapsync to move mailboxes from an MS Exchange server to a Dovecot based Linux mailserver.
Synchronising Microsoft Exchange to Another IMAP Server – BarryODonovan.com
From experience I can say that using imapsync for moving from Dovecot to Dovecot works like a charm, but I never had the opportunity to use it with MS Exchange.
have fun…

Thanks for the advice, I’ll give it a try.