Exchange 2010 to 2016 Mailbox Migration

I'm moving mailboxes from exchange 2010 to 2016. environment is co-existence mode. I moved a single mailbox with no issues and cut it over to 2016. I then batch moved 4 mailboxes and set then to no complete at 95% so that I can complete the batch when ready.  this is also fine. while those are synced at 95% I'm attempting to to move another single mailbox and it started moving but then stalled at 20% for about an hour with a status of "stalled due to target_processor". resources are fine and so is CPU. I looked at the migration report and there are no failures or errors and all processes, initializations, and prep for the migration is fine. No errors in the eventlogs either about this. Has anyone seen this? I haven't changed any throttling or anything.
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timgreen7077Exchange EngineerAsked:
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RoninCommented:
Try running repair on the mailbox.
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timgreen7077Exchange EngineerAuthor Commented:
ran the repair and no corruption was found.
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timgreen7077Exchange EngineerAuthor Commented:
I should also mention that after the migration didn't progress after about an hour and the status never changed, I decided to stop the migration and then deleted the request. The move started fine me but then it stopped with that status message for about an hour and that's when I open this ticket with experts exchange. it migrated about 150MB and 4300 items before the message. mailbox is 5GB
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RoninCommented:
What are the RU and CU versions for both Exchange servers?
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timgreen7077Exchange EngineerAuthor Commented:
exchange 2016 is CU7
EXCHANGE 2010 IS SP3 RU13
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RoninCommented:
Try migrating this mailbox to a different database on the same server.
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Sandeep KumarAssociate ConsultantCommented:
What after check migration that specific mailbox to different database of same server as suggested by Ronin? Exchange migration can be done if there is no corruption. Check https://www.nucleustechnologies.com/how-to/migrate-exchange-2010-to-2016.html for migration of mailboxes from Exchange 2010 to 2016.

If Exchange Server is corrupted then you can use Kernel for Exchange Server recovery tool to repair damaged (or corrupted) Exchange Server database. Visit: https://www.nucleustechnologies.com/Exchange-Server-Data-Recovery.html to know more about Exchange Recovery tool.
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timgreen7077Exchange EngineerAuthor Commented:
The mailbox won't even move to a different 2010 database. it doesn't fail or give errors. I will attempt to export to pay and then recreate the mailbox.
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RoninCommented:
There's a mailbox move log.
Execute the following command to view it.
Get-MoveRequestStatistics -Identity user@domain.com | Format-List

Open in new window

or export it to a file.
Get-MoveRequestStatistics -Identity user@domain.com -IncludeReport | Export-CSV C:\temp\movembx.csv

Open in new window

See here for more details.
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timgreen7077Exchange EngineerAuthor Commented:
I after failing to even successfully migrate the mailbox to another Exchange 2010 DB, i decided to export the mailbox to a pst, disable the mailbox, recreate the mailbox in Exchange 2016, and imported the mail to the new mailbox. Before importing the mail i attempted to connect to the pst via outlook and there was issues so I had to run a pst repair in order to access the pst and there was alot of issues with it. After the repair I imported the mail to the new mailbox.
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timgreen7077Exchange EngineerAuthor Commented:
This is the only solution that seemed to work without using 3rd party tools as suggested.
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