Hello, I need to migrate some servers from old ISPConfig version (3.0.3 & 220.127.116.11) to new ISPConfig servers 3.1, I've been looking for the best way to migrate the email accounts, my concern is that the old mail servers are running under Courier IMAP/POP3 Daemon and Mailfilter Syntax is Maildrop. I have the option to set up the new server under Courier/Maildrop but I've read that Dovecot is recommended on new installations; right now the new servers are configured under Dovecot/Sieve. What kind of tools or procedure would you recommended to perform the migration?. Also I have the option to copy the email mailboxes to a external hard drive and then copy to the new server but I don't know if this procedure is accurate or recommended and if they would be readable by the new servers. I would really appreciate your feedback and advices. Thanks in advance.