Using the GUI, I can add a new UPN by opening "AD Domains and Trusts", right clicking on the top item in the left pane and selecting properties. If I want to add it via script, I use Robbie's recipe 6.32.
 
But I can create all the users I want programmatically with any UPN I want without putting that UPN into the uPNSuffixes attribute.
 
Is the only purpose for this attribute to make it easier in ADU&C to pick a UPN value?
 

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