User Principle Name
Abbreviation: UPN
The user principal is an Internet-style login name for the user based on the Internet standard RFC 822. By convention, this should map to the user's email name. The general format is alias@domain.
The user principal is an Internet-style login name for the user based on the Internet standard RFC 822. By convention, this should map to the user's email name. The general format is alias@domain.