| EX544221 | Exchange Online | On-premises and tenant-to-tenant mailbox migrations initially fail to complete, then complete after restarting |
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| Status | serviceDegradation |
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| Classification | advisory |
| User Impact | On-premises and tenant-to-tenant mailbox migrations initially fail to complete, then complete after restarting. |
| Last Updated | 04/26/2023 20:04:04 |
| Start Time | 04/18/2023 10:00:00 |
| End Time | |
| Latest Message | Title: On-premises and tenant-to-tenant mailbox migrations initially fail to complete, then complete after restarting
User impact: On-premises and tenant-to-tenant mailbox migrations initially fail to complete, then complete after restarting. More info: When the issue first started, mailbox migrations were failing even after they restarted. Currently, the affected mailbox migrations appear to succeed after they automatically restart. Current status: After our investigation, we’ve determined that a recent change altered the source where the migration service selects a specific folder for copying during migrations, causing the incorrect folder to be selected and the copy job failing. We’ve developed a fix to ignore this folder, as the folder is non-essential and is being deprecated, and are testing it to ensure it resolves impact as expected before applying it to the affected environment. Scope of impact: This issue may impact any admins doing on-premises or tenant-to-tenant mailbox migrations. Start time: Tuesday, April 18, 2023, at 10:00 AM UTC Root cause: A recent change altered the source where the migration service selects a specific folder for copying during migrations, causing the incorrect folder to be selected and the copy job failing. Next update by: Thursday, April 27, 2023, at 6:00 PM UTC |