The Migration service
MRS proved to be one of the most effective and useful new features introduced in Exchange 2010. However, on-premises administrators found that the creation and management of mailbox move requests required a lot of hands-on intervention. For example, if a move failed, an administrator would have to determine what the problem was, fix any issue that was found, and then re-queue the move request.
Microsoft encountered many of the same difficulties as it began moving large numbers of customer mailboxes to Office 365. The solution was to build a framework to allow customers to set up batches of mailboxes for migration from on-premises (IMAP or Exchange) servers to the Exchange Online cloud service. Moves occurred in the background, ...
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