Don't use Exchange Server Database Portability as a Migration Method
Database portability is good for disaster recovery, not so good for moving mailboxes from one Exchange Server to another.
September 12, 2016
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Exchange Server 2010: Using Database Portability for Disaster Recovery
How to use Exchange 2010 Database Portability in a disaster recovery scenario to mount a mailbox database on another Mailbox server.
July 13, 2011