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Articles about migration errors when performing a Office 365 Mailbox migration.
404 Not Found
Active Directory is unavailable. Try again later.
Discovery services did not return a valid Exchange Web Service URL
Error - Office 365 to Office 365 with Coexistence - The operation has timed out
Error - Outlook Client connects to Office 365 before cutover
Error: Service endpoint not found
http POST request to 'autodiscover-s.outlook.com' failed - 456 / 457
Internal Server Transient Error
No Associated Mailbox SMTP Error
No mailbox with such GUID - ErrorNonExistentMailbox
Office 365 User Names Error
Server Cannot Service This Account
The account does not have permission to impersonate the requested user
Token Serialization Denied - Error
Unable to connect to the remote server
Updating Calendar Events Post-Migration