Does Domino support IMAP? If so, you can use any IMAP client (including imapsync) to migrate messages from one server to the other.
Does Domino support iCal? If so, you can use any iCal client to migrate their calendars from one server to the other.
Does Domino support WebDAV? If so, you can use any WebDAV client to migrate their files/briefcases from one server to the other.
Does Domino support CSV/LDIF/iCal/vCal? If so, you can easily export and import their addressbooks.
The beauty of Zimbra is that none of your data is locked in. All of your data is easily accessible using industry standards. So long as you know what format the destination server expects, you can extract and convert your data quite easily.
(And vice versa for migrating data into Zimbra.)
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Freddie
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