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When a user uses a UPN to log on to a domain, the UPN is validated by searching the local domain and then the global catalog.
When a SID has been used as the unique identifier for a user or group, it cannot be used again to identify another user or group.
The s IDHistory attribute contains the previous SIDs for the user object. A user object has previous SIDs if the user was moved to another domain.
A user object is a security principle, so it also includes the following user naming attributes: The user Principal Name attribute is the logon name for the user.
The attribute consists of a user principal name (UPN), which is the most common logon name for Windows users.
Each time a user logs on, the system retrieves the user's SID from the directory and places it in the user's access token.