All you need to do in that case is to run the Zimbra OSS installer on your NE server and it will 'upgrade' to the OSS version, no need for a migration. Block incoming mail on port 25 and make a backup using NE backup tool and a copy of the /opt/zimbra directory structure (you should shutdown Zimbra for this) before the upgrade. When you've run the upgrade script unblock port 25.
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Regards
Bill
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