Additional UPN Suffix in AD\Exchange 2007

While planning and Exchange migration, alongside a separate AD forest migration I had the requirement to assign an additional UPN suffix to users without adding it to the forest. To complicate things further this only needed to be available to mailboxes in a certain OU.

The solution is to add to the uPNSuffixes attribute using ADSIEdit on the OU in question.


When creating a user/mailbox now using ADUC or the Exchange management console I can choose ‘’ as the UPN suffix, rather than a domain added at the AD forest level.



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