Migrating individual user accounts and saved emails Options

[Renato]

Hello,
I have completed a migration from Ensim X to Plesk 8.6
Most domains and accounts were successfully migrated using the built in Migration Manager but, there are some domain user accounts that were not migrated, or have problems with saved email folders, and I'd like to know:
1- How can I migrate an individual user account form the old Ensim X, to the new Plesk.
2- The saved email folders the users used to have access using OpenWebmail are now stored under:
/var/www/vhosts/domain.com/web_users/username/mail/
but they are not available under Horde, how can I move, export/import those folders to be available under Horde WebMail.

Thanks for all your help,
Renato