This document provides guidelines for migration of user accounts and data from any IMAP server to the Kerio MailServer's store. Such migration requires a special tool called Kerio IMAP Migration Tool which can be downloaded for free from the Kerio Technologies website.
The following data can be migrated:
Domains
Users
Email folders in mailboxes
Email messages
If the source IMAP server supports groupware data (contacts, events, tasks, etc.) and the data is available via the IMAP protocol, the data will be included in the migration. However, the Kerio IMAP Migration Tool does not perform conversion of such data. In the Kerio MailServer store, they are saved in the same format as on the source server. It will be probably impossible to view the data in email clients with exception of the folders themselves.
Data migration from Kerio MailServer as a source IMAP server is not supported.