ISPConfig 3 mail import from ISPConfig 2
i've change my server control panel from ISPConfig 2 to ISPConfig 3.
I have save all web mails from old server and now i want to import mail's in new server , but didn't work.
i tried to copy all mails from Maildir, and i have change the permission of hole folder /vmail with "chmod -R vmail:vmail /var/vmail".
How is the method to import all my clients emails from old server?