Exchange 2013/2019 Mailbox Migration with Errors

[Squan_JRP]

We are running exchange 2013 in hybrid but still have some on-prem mailboxes. Recently added a new exchange 2019 server into the environment to migrate everything to so we can eliminate the 2013 server. Got it set up and tried migrating the first mailbox. It was a large mailbox of about 50GB.

 

About 20 hours into the move, I got a confirmation email saying "The migration process failed to complete because it has encountered errors. You can fix these errors, and try to complete the migration again. Or you can complete the migration and select the option to ignore any errors associated with the migration."

 

However, despite getting this, I could still see that the migration was still going using Get-MigrationUserStatistics command in the management shell.

 

After about 3 days, I see from the same log that the migration is complete (see log entries below), but in the ECP it is still saying status as "Completed with errors" and saying "Failed mailboxes: 1"

 

In the log entries from the management shell I can see things like "Copying messages is complete" and "Mailbox store finalization is complete" and "Mailbox contents verification complete."

 

There is an option to complete the migration batch, but I am just nervous since it still says there were errors.

 

Is it safe to complete the batch now or are there other things I should be checking first to make sure this is successful?

 

Here's an except of the end of the log using Get-MigrationUserStatistics:

 

12/29/2019 4:18:49 AM [EXCHANGE19] Stage: CopyingMessages. Percent complete: 94. 12/29/2019 4:18:49 AM [EXCHANGE19] Copy progress: 796696/797488 messages, 50.56 GB (54,286,927,922 bytes)/50.6 GB (54,332,554,316 bytes), 10/62 folders completed. 12/29/2019 4:23:34 AM [EXCHANGE19] Copying messages is complete. Copying rules and security descriptors. 12/29/2019 4:23:49 AM [EXCHANGE19] Initial seeding completed, 797488 items copied, total size 50.6 GB (54,332,540,906 bytes). 12/29/2019 4:23:50 AM [EXCHANGE19] Stage: CopyingMessages. Percent complete: 95. 12/29/2019 4:23:50 AM [EXCHANGE19] Copy progress: 797488/797488 messages, 50.6 GB (54,332,540,906 bytes)/50.6 GB (54,332,540,906 bytes), 54/62 folders completed. 12/29/2019 4:23:50 AM [EXCHANGE19] Folder hierarchy changes reported in source '814f5c95-21e6-4b83-a3a1-5873d4bd1dbe (Primary)': 0 changed folders, 0 deleted folders. 12/29/2019 4:23:50 AM [EXCHANGE19] Total content changes applied to mailbox '814f5c95-21e6-4b83-a3a1-5873d4bd1dbe (Primary)': New 0, Changed 0, Deleted 0, Read 0, Unread 0, ItemUpdates 0, Skipped 0, Total 0. 12/29/2019 4:23:50 AM [EXCHANGE19] Incremental Sync '814f5c95-21e6-4b83-a3a1-5873d4bd1dbe (Primary)' completed: 0 hierarchy updates, 0 content changes. 12/29/2019 4:23:51 AM [EXCHANGE19] Stage: IncrementalSync. Percent complete: 95. 12/29/2019 4:23:51 AM [EXCHANGE19] Final sync has started. 12/29/2019 4:23:51 AM [EXCHANGE19] Folder hierarchy changes reported in source '814f5c95-21e6-4b83-a3a1-5873d4bd1dbe (Primary)': 0 changed folders, 0 deleted folders. 12/29/2019 4:23:51 AM [EXCHANGE19] Total content changes applied to mailbox '814f5c95-21e6-4b83-a3a1-5873d4bd1dbe (Primary)': New 0, Changed 0, Deleted 0, Read 0, Unread 0, ItemUpdates 0, Skipped 0, Total 0. 12/29/2019 4:23:52 AM [EXCHANGE19] Incremental Sync '814f5c95-21e6-4b83-a3a1-5873d4bd1dbe (Primary)' completed: 0 hierarchy updates, 0 content changes. 12/29/2019 4:23:52 AM [EXCHANGE19] Source mailbox information: Regular Items: 797463, 50.6 GB (54,332,541,763 bytes) Regular Deleted Items: 0, 0 B (0 bytes) FAI Items: 26, 30.52 KB (31,253 bytes) FAI Deleted Items: 0, 0 B (0 bytes) 12/29/2019 4:23:52 AM [EXCHANGE19] Stage: FinalIncrementalSync. Percent complete: 95. 12/29/2019 4:23:52 AM [EXCHANGE19] Copying per user read/unread data. 12/29/2019 4:23:52 AM [EXCHANGE19] Per user read/unread data copied successfully. 12/29/2019 4:23:53 AM [EXCHANGE19] Mailbox store finalization is complete. 12/29/2019 4:23:53 AM [EXCHANGE19] SessionStatistics updated. 12/29/2019 4:23:53 AM [EXCHANGE19] Verifying mailbox contents... 12/29/2019 4:30:06 AM [EXCHANGE19] Mailbox contents verification complete: 15 folders have been examined, 39 empty folders have been skipped, 797488 items, 50.6 GB (54,332,540,906 bytes). 12/29/2019 4:30:09 AM [EXCHANGE19] Mailbox 'ONPREMMailbox1' was loaded from domain controller 'DC1.domain.local'. 12/29/2019 4:30:09 AM [EXCHANGE19] Target mailbox information: Regular Items: 797463, 52.09 GB (55,926,039,968 bytes) Regular Deleted Items: 0, 0 B (0 bytes) FAI Items: 26, 34.44 KB (35,269 bytes) FAI Deleted Items: 0, 0 B (0 bytes) 12/29/2019 4:30:34 AM [EXCHANGE19] PrimarySize: 55926039968, ArchiveSize: 0, DumpsterSize: 0, ArchiveDumpsterSize: 0 12/29/2019 4:30:34 AM [EXCHANGE19] PrimaryQuota: 59055800320, ArchiveQuota: 53687091200, DumpsterQuota: 32212254720, ArchiveDumpsterQuota: 32212254720 12/29/2019 4:30:34 AM [EXCHANGE19] Mailbox was updated using domain controller 'DC1.domain.local'. 12/29/2019 4:30:40 AM [EXCHANGE19] Mailbox 'ONPREMMailbox1' was updated on domain controller 'DC1.domain.local'. 12/29/2019 4:30:40 AM [EXCHANGE19] Stage: FinalIncrementalSync. Percent complete: 95. 12/29/2019 4:30:41 AM [EXCHANGE19] Move has completed and final cleanup has started. 12/29/2019 4:30:41 AM [EXCHANGE19] The Directory Cache on the source mailbox '814f5c95-21e6-4b83-a3a1-5873d4bd1dbe (Primary)' was successfully populated after the move. 12/29/2019 4:30:44 AM [EXCHANGE19] Source mailbox '814f5c95-21e6-4b83-a3a1-5873d4bd1dbe (Primary)' was successfully cleaned up after the move. 12/29/2019 4:30:45 AM [EXCHANGE19] Target mailbox information: Regular Items: 797463, 52.09 GB (55,926,039,968 bytes) Regular Deleted Items: 0, 0 B (0 bytes) FAI Items: 26, 34.44 KB (35,269 bytes) FAI Deleted Items: 0, 0 B (0 bytes) 12/29/2019 4:30:45 AM [EXCHANGE19] Target mailbox '814f5c95-21e6-4b83-a3a1-5873d4bd1dbe (Primary)' was successfully reset after the move. 12/29/2019 4:30:46 AM [EXCHANGE19] Request is complete.

[3s-gtech]

When migrating from 2013 to 2016, I had odd mailboxes that would fail to migrate (there were 1500 on there). I found that every one would succeed when tried a second time.

[Squan_JRP]

Hmm, okay, this was actually the 4th attempt I made to migrate it. This was the first time it even got this far.

[3s-gtech]

50GB is pretty big - biggest I did was maybe 10GB. Is it possible to do some trimming first? I’m not sure if there’s a timeout on the migration set via Powershell - extending that may be another option.