"We'll keep the mailboxes in sync until you either complete or delete the migration batch." What to do now?

Question

_{Thursday, July 9, 2020 7:21 PM}

I am moving mailboxes from on-prem 2013 to on-prem 2019.  I have a migration batch that had 10 mailboxes and I just got a migration batch report email that says "We'll keep the mailboxes in sync until you either complete or delete the migration batch." instead of completed.  I open the included csv and 9 of the users say completed but one has a status of "Synced" and I noticed they have 121,155 messages, if that matters.  What do I do now?  

EDIT:  I had another mailbox in a batch yesterday that had over 168,000 messages in it that completed on its own so I guess it's not due to the number of messages.

EDIT2:  When I run Get-MoveRequest all of them, including that one, is saying completed.  I refreshed ECP and 10 out of 10 are saying completed now and I just got the completion email so all good.  But what caused this batch to send me that weird email part way through, none of the other batches have done that.  

All replies (1)

_{Friday, July 10, 2020 4:59 AM ✅Answered}

Hi Jeff,

>> "We'll keep the mailboxes in sync until you either complete or delete the migration batch."

Regarding this notification message, I tried to do much research but didn’t find any official documents stating what will trigger it. Per my understanding, it might be related to the “Synced” status of one of the mailboxes that were being migrated. 

Generally, the “Synced” status means the migration process has finished the initial synchronization and the mailbox is ready to be finalized, while “Completed” occurs once the mailbox has been fully migrated across. Normally, if the migration batch is configured to ”Automatically complete”, the finalization will complete automatically and the status will be changed to “Completed” and no manual intervention is required. How the status of individual job items should flow during a successful finalization can be illustrates as follows:

Reference: Troubleshoot finalization of the migration process.

Given this, my assumption is that maybe the mailbox with “Synced” status spent some longer time than the other mailboxes performing the incremental synchronization or other finalization processes, and the “We'll keep the mailboxes in sync” message was probably sent to let you know that the syncing connection will be kept before the migration process fully completed.

Anyway, as neither of the report message nor the Get-MoveRequest output indicate any “fail” or “error”, personally I would suggest worrying nothing about this message and just waiting for the migration process to complete automatically. 

In case the mailbox stuck in “Synced” status for too long, you may try to trigger the completion of a single mailbox in a batch using the cmdlet below:

Set-MoveRequest -Identity “[email protected]” -CompleteAfter 1

Reference: How to: Complete an Individual mailbox Move Requests from a Migration Batch.
(Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.)

Regards,

Yuki Sun

Please remember to mark the replies as answers if they helped. If you have feedback for TechNet Subscriber Support, contact [email protected].