The Mailbox Replication service
The Exchange Mailbox Replication service (MRS) is the service that is responsible for processing move, import, export, and restore requests. In Exchange 2013, the MRS runs on every Mailbox server rather than on the Client Access Server (CAS), as is the case in Exchange 2010. The name of the MRS process is MSExchangeMailboxReplication.exe, sometimes confused with the database replication used with Database Availability Groups (DAGs; MSExchangeReplication.exe), but they are separate and very different processes.
Along with the relocation of MRS to the Mailbox server, the other important points of difference between Exchange 2013 and Exchange 2010 are that:
MRS now only scans for move requests registered in the system ...
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