In an Exchange Hybrid environment (using Office 365).
In Exchange Management Console (EMC), under Move Request, there is some mailbox being moved. This action was not done by the local IT administrators. The mailbox affected are mailboxes already migrated to Office 365.
Run a Get-MoveRequest and if you see something like below, you are actually seeing the database being moved from Exchange Online DB to another Exchange Online DB. This is part of Exchange Online DB maintenance. There is no impact to users.
ExchangeGuid : 404b747c-d942-4ecc-ba61-9459c234a8d3
SourceDatabase : APCPR04DG020-db001
TargetDatabase : APCPR04DG011-db170
Flags : IntraOrg, Pull, MoveOnlyPrimaryMailbox
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