Moving mailboxes in Exchange is relatively a painless task, but when you run into issues like space or network problems then all the moves you started all begin to fail.

Here is an example of a DAG going down and all the moves failing with the following error:

Error: Move for mailbox ‘mailbox1’ is stalled because DataMoveReplicationConstraint is not satisfied for the database ‘DAG1-STORE1’ (agent MailboxDatabaseReplication). Failure Reason: Database <> does not satisfy constraint SecondCopy. Throttling completion as database copies are falling behind.

If you look at the properties of the mailbox move:

Exchange 2010:- mailbox move fails

and then head over to the details tab:

Exchange 2010:- mailbox move fails

The solution to this? Make sure the DAG is online and network connectivity restored, you can then resume the move and it should complete.

Hope it helps.

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