You can use database portability to move a Microsoft Exchange Server 2013 mailbox database between Exchange 2013 Mailbox servers in the same organization.

What do you need to know before you begin?

    Estimated time to complete: 5 minutes, plus the time it takes to restore the data, move the database files, and wait for Active Directory replication to complete.

    You need to be assigned permissions before you can perform this procedure or procedures. To see what permissions you need, see the "Mailbox recovery" entry in the Recipients Permissions topic.

    You can't use the EAC to move user mailboxes to a recovered or dial tone database using database portability.
 

https://technet.microsoft.com/en-us/library/dd876926(v=exchg.150).aspx