User Principal Name (UPN)
In the Windows
Directory, a User Principal Name (UPN) is the name of a system user in an e-mail address
format. The user name (or "username") is followed by the "at sign" followed
by the name of the Internet domain with which
the user is associated. An example might look like: firstname.lastname@example.org. The UPN
format is based on Internet RFC 822.
This was last updated in September 2005
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