Office 365 Migration – Adding Additional UPNs

In my previous post office-365-migration-user-attribute-discovery-export-powershell/ I described the importance of matching your user UPN with their primary SMTP Address. A scenario I recently came across was where the customer didnt have the correct UPN Suffix registered in their Active Directory Forest. For example, the root domain was contoso.com so all their UPNs were similar to john.doe@contoso.com. …

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