[Sorry if this duplicates a comment I just posted, I had meant to post this as a reply, not a comment so I'm re-posting this as a reply.]
The issue we have is we use a control panel (Website Panel) that manages all aspects of the domain, including creating and maintaining email accounts in SmarterMail.
As far as we know Website Panel has no facility to import accounts from SmarterMail so if we follow a standard migration path as described in that article, the email accounts we brought across cannot be updated using the Control Panel. Also we have a number of old accounts that we don't want to migrate, as well as a number of existing accounts that have very insecure passwords.
So we decided the best option was to use this as a clean up exercise at the same time and setup and create all the email accounts from fresh using the new Control Panel and then just copy across the email files into the user folders, for the users that need to be migrated.
This is what we've done but we cannot get SmarterMail to recognise the email files we have copied into the new User folders in the SmarterMail installation on the new server.
Is this possible?