How to Update All UPNs in an Organisation to Match Primary Email Address

If you’re transitioning to Office 365, Windows Azure Active Directory, or any other of the many ?aaS offerings that require routable UPNs (that is, a UPN with a publicly resolvable domain name that you own) you’ve likely stumbled across a need to change UPNs en masse. While ADUC gives us the option to change just the suffix for ...

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