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
- Microsoft Modern and Secure DesktopCreate the modern and secure desktop by deploying Windows 10 and Office 365 ProPlus in your organization.
- Readiness Toolkit for Office add-ins and VBAThe Readiness Toolkit for Office add-ins and VBA helps you identify compatibility issues with your Microsoft Visual Basic for Applications (VBA) macros and your installed add-ins. Use this tool to inspect VBA macro code and get readiness information for installed Office add-ins.
- Microsoft Teams Workshop Decision Points SummaryUse the Microsoft Teams Workshop Decision Points Summary to track all decision points and next steps made in the Planning Workshop for Microsoft Teams and referenced in related Help content.
- Planning Workshop for Microsoft TeamsUse the Planning Workshop for Microsoft Teams presentation to have an interactive conversation with attendees about getting started with Microsoft Teams.
- Microsoft Teams Pre-Workshop QuestionnaireUse the Microsoft Teams Pre-workshop Questionnaire to collect basic information about your organization's current Office 365 environment and to allow an informed workshop leader to customize content prior to leading a Microsoft Teams Planning Workshop.
Microsoft Security Updates
- Security Update For Exchange Server 2013 CU17 (KB4036108)Security Update For Exchange Server 2013 CU17 (KB4036108)
- Security Update For Exchange Server 2013 CU16 (KB4036108)Security Update For Exchange Server 2013 CU16 (KB4036108)
- Security Update For Exchange Server 2016 CU5 (KB4036108)Security Update For Exchange Server 2016 CU5 (KB4036108)
- Security Update For Exchange Server 2013 SP1 (KB4036108)Security Update For Exchange Server 2013 SP1 (KB4036108)
- Security Update For Exchange Server 2016 CU6 (KB4036108)Security Update For Exchange Server 2016 CU6 (KB4036108)
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