PST Import Service: Import Job Fails With MailboxAmbiguous Error

By Ashwin Venugopal -

 







Symptoms

When utilizing the Microsoft 365 Import Service in the Security & Compliance Center to import PST files via network or drive shipping, you might encounter an error message. 

Cause

This problem arises when there are items that share the same user principle name (UPN) or Simple Mail Transfer Protocol (SMTP) address in Exchange Online. 

Workaround

To work around this issue, run the following commands to see whether the objects are recipients or soft-deleted users:

Get-Recipient <SMTP_ADDRESS>
Get-Mailbox <SMTP_ADDRESS> -SoftDeleteMailbox
Get-MailUser <SMTP_ADDRESS> -SoftDeleteMailuser 

After you find the user, you can use the Exchange GUID as the target mailbox in mapping the CSV file. 

Conclusion

The issue related to PST import service is resolved.



























































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