Issue
We removed migrated data to remediate a mailbox, and we noticed some calendar items reappeared in the user's target mailbox, but we had not migrated them again. Why did this happen?
Cause
Calendar Repair Assistant (CRA) in Office 365 will run, and see a meeting was removed, and replace it, thinking the meeting was removed in error.
Solution
Calendar Repair Assistant (CRA) in Office 365 may have adverse impact on meetings and recurring meetings after migrations. It is recommended that CRA be disabled during the start of any migration.
This service may be enabled after the migration has been successful concluded and the end-user has been moved to their new mailbox.
There is no known negative impact when Calendar Assistant is disabled temporarily.
Use PowerShell (PS) to create a remote session to Office 365 tenant then execute the following commands:
Get-Mailbox -ResultSize unlimited | Set-Mailbox -CalendarRepairDisabled $true
The Calendar Assistant is now disabled for all mailboxes in the Office 365 tenant. It can be enabled again by using this PS command:
Get-Mailbox -ResultSize unlimited | Set-Mailbox -CalendarRepairDisabled $false
Additional Information
Related Articles
NM: What is Calendar Repair Assistant (CRA), and why it should be disabled during migrations
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