Setup:
Hybrid Setup Exchange 2010 and Office 365
When migrating mailboxes in batches to office 365 using the Office 365 admin portal I had a couple of mailboxes fail when the mailbox status was completing. After about 20 minutes with mailboxes being stuck on completing. The following error appeared in the logs:
Error: SyncTimeoutException: Email migration failed for this user because no email could be downloaded
To resolve the issue with the mailboxes I deleted them from the batch and created a separate batch with the failed mailbox(s) and ran the migration again. This resolved the issue. When migrating mailboxes I found that migration them in batched of about 20-25 worked fine. When I had larger numbers or total emails for the batch exceeding 400-450k it seemed to cause issues. It could have just been coincidence but the smaller batches worked fine.
Office 365 Updates
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- Office 2016 Administrative Template files (ADMX/ADML) and Office Customization ToolThis download includes Group Policy Administrative Template (ADMX/ADML) and Office Customization Tool (OPAX/OPAL) files for Microsoft Office Professional Plus 2016 and Office 365 ProPlus 2016 apps.
- Language Packs (SP1) for SharePoint Foundation 2013 SP1Language packs enable creation of sites and site collections in multiple languages without requiring separate installations of SharePoint Foundation 2013 SP1
Microsoft Security Updates
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