In Office 365 I have this error message in the GUI.
Exchange: The execution of cmdlet Set-SyncMailbox failed.
Exchange: An unknown error has occurred.
I have looked for this cmdlet and haven't been able to find it yet. Does anyone have a reference to this?
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That's a cmdlet that was used back in the Live@EDU days... I don't think any O365 customer has access to it anymore. Best open a support case.