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Migrating a complex folder structure between Exchange On-Premise and Office365 (Hybrid Mode)

Posted on 2015-02-03
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Last Modified: 2016-06-23
Guys, I am having a major pain migrating a user within a Hybrid configuration between Exchange 2010 on premise and O365. I have migrated 300 users to date without issue and am left with this user.
I have troubleshot the error logs but no luck yet. One thing that jumps out at me from reading the logs is that the user has a whopping 1,477 folders. I would imagine this might be an issue, but wondering if there are limits or a history of very large folder structures causing issue.
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Question by:paologiorgio
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Expert Comment

by:Vasil Michev (MVP)
ID: 40587002
Probably you are hitting the bad number limit? Any particular errors?
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Expert Comment

by:Sudhir Bidye
ID: 40588394
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Author Comment

by:paologiorgio
ID: 40588463
@vasil, error is as below.....

​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​04/02/2015 11:49:50 [AM3PR02MB242] '' created move request.
04/02/2015 11:49:50 [AM3PR02MB242] '' allowed a large amount of data loss when moving the mailbox (10 bad items, 1000 large items).
04/02/2015 11:49:58 [AM3PR02MB0375] The Microsoft Exchange Mailbox Replication service 'AM3PR02MB0375.eurprd02.prod.outlook.com' (15.1.75.24 caps:1FFF) is examining the request.
04/02/2015 11:49:58 [AM3PR02MB0375] Connected to target mailbox 'XXi365.onmicrosoft.com\d1455192-85cf-471c-bddd-4c0f9d9e1a2e (Primary)', database 'EURPR02DG024-db026', Mailbox server 'AM3PR02MB0375.eurprd02.prod.outlook.com' Version 15.1 (Build 75.0).
04/02/2015 11:49:59 [AM3PR02MB0375] Connected to source mailbox 'XXi365.onmicrosoft.com\d1455192-85cf-471c-bddd-4c0f9d9e1a2e (Primary)', database 'XXAI1-MBDB3', Mailbox server 'XXAI-EX2.XXai.local' Version 14.3 (Build 195.0), proxy server 'XXAI-EXFE.XXai.local' 14.3.178.0 caps:05FFFF.
04/02/2015 11:49:59 [AM3PR02MB0375] Request processing started.
04/02/2015 11:49:59 [AM3PR02MB0375] Source mailbox information:
Regular Items: 31266, 3.588 GB (3,852,665,776 bytes)
Regular Deleted Items: 16040, 452 MB (473,971,321 bytes)
FAI Items: 443, 0 B (0 bytes)
FAI Deleted Items: 0, 536 B (536 bytes)
04/02/2015 11:49:59 [AM3PR02MB0375] Cleared sync state for request d1455192-85cf-471c-bddd-4c0f9d9e1a2e due to 'CleanupOrphanedMailbox'.
04/02/2015 11:49:59 [AM3PR02MB0375] Mailbox signature will not be preserved for mailbox 'XXi365.onmicrosoft.com\d1455192-85cf-471c-bddd-4c0f9d9e1a2e (Primary)'. Outlook clients will need to restart to access the moved mailbox.
04/02/2015 11:50:01 [AM3PR02MB0375] Stage: CreatingFolderHierarchy. Percent complete: 10.
04/02/2015 11:50:02 [AM3PR02MB0375] Initializing folder hierarchy from mailbox 'XXi365.onmicrosoft.com\d1455192-85cf-471c-bddd-4c0f9d9e1a2e (Primary)': 788 folders total.
04/02/2015 11:50:02 [AM3PR02MB0375] Folder creation progress: 0 folders created in mailbox 'XXi365.onmicrosoft.com\d1455192-85cf-471c-bddd-4c0f9d9e1a2e (Primary)'.
04/02/2015 11:53:27 [AM3PR02MB0375] Transient error TimeoutErrorTransientException has occurred. The system will retry (1/60).
04/02/2015 11:53:59 [AM3PR02MB0375] The Microsoft Exchange Mailbox Replication service 'AM3PR02MB0375.eurprd02.prod.outlook.com' (15.1.75.24 caps:1FFF) is examining the request.
04/02/2015 11:53:59 [AM3PR02MB0375] Connected to target mailbox 'XXi365.onmicrosoft.com\d1455192-85cf-471c-bddd-4c0f9d9e1a2e (Primary)', database 'EURPR02DG024-db026', Mailbox server 'AM3PR02MB0375.eurprd02.prod.outlook.com' Version 15.1 (Build 75.0).
04/02/2015 11:54:39 [AM3PR02MB0375] Transient error CommunicationErrorTransientException has occurred. The system will retry (2/60).
04/02/2015 11:55:14 [AM3PR02MB0375] The Microsoft Exchange Mailbox Replication service 'AM3PR02MB0375.eurprd02.prod.outlook.com' (15.1.75.24 caps:1FFF) is examining the request.
04/02/2015 11:55:14 [AM3PR02MB0375] Connected to target mailbox 'XXi365.onmicrosoft.com\d1455192-85cf-471c-bddd-4c0f9d9e1a2e (Primary)', database 'EURPR02DG024-db026', Mailbox server 'AM3PR02MB0375.eurprd02.prod.outlook.com' Version 15.1 (Build 75.0).
04/02/2015 11:55:19 [AM3PR02MB0375] Connected to source mailbox 'XXi365.onmicrosoft.com\d1455192-85cf-471c-bddd-4c0f9d9e1a2e (Primary)', database 'XXAI1-MBDB3', Mailbox server 'XXAI-EX2.XXai.local' Version 14.3 (Build 195.0), proxy server 'XXAI-EXFE.XXai.local' 14.3.178.0 caps:05FFFF.
04/02/2015 11:55:20 [AM3PR02MB0375] Relinquishing job because the mailbox is locked. The job will attempt to continue again after 04/02/2015 12:00:20.

@Sudhir,

Have reviewed those limits and believe this may be my issue, but can't be sure, is there a good tool to do a specific folder count under folders ?
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Expert Comment

by:Sudhir Bidye
ID: 40588585
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Author Comment

by:paologiorgio
ID: 40590003
Folders have been reduced to 791, so now it's not a limit issue. Started migration again and still it comes up Mailbox is locked after a period of running through the below process. I have got a printout of the folder structure. Are there certain symbols or lengths that are not allowed and i can search? otherwise does the below shed any light as to where the issue is ?

created move request.
The Microsoft Exchange Mailbox Replication service is examining the request.
Connected to target mailbox
Connected to source mailbox
Request processing started.
Source mailbox information:
Regular Items: 31314, 3.592 GB (3,856,803,019 bytes)
Regular Deleted Items: 15329, 385.5 MB (404,276,504 bytes)
FAI Items: 443, 0 B (0 bytes)
FAI Deleted Items: 0, 536 B (536 bytes)
Cleared sync state for request d1455192-85cf-471c-bddd-4c0f9d9e1a2e due to 'CleanupOrphanedMailbox'.
Mailbox signature will not be preserved for mailbox. Outlook clients will need to restart to access the moved mailbox.
Stage: CreatingFolderHierarchy. Percent complete: 10.
Initializing folder hierarchy from mailbox: 791 folders total.
Folder creation progress: 0 folders created in mailbox
Transient error TimeoutErrorTransientException has occurred. The system will retry (1/60).
The Microsoft Exchange Mailbox Replication service is examining the request.
Connected to target mailbox
Connected to source mailbox
Relinquishing job because the mailbox is locked. The job will attempt to continue again after 04/02/2015 21:26:17.
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Accepted Solution

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paologiorgio earned 0 total points
ID: 40590812
Turns out the issue was to do with the Search folders. When i ran the command "outlook.exe /cleanfinders" as suggested in another article the migration finally kicked off.
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