You can use Active Directory Domains and Trusts to add user principal name (UPN) suffixes for the existing user account. The default UPN suffix for a user account is the Domain Name System (DNS) domain name of the domain that contains the user account. You can add alternative UPN suffixes to simplify administration and user logon processes by providing a single UPN suffix for all users. The UPN suffix is used only within the Active Directory forest, and it is not required to be a valid DNS domain name.
Membership in Domain Admins or Enterprise Admins, or equivalent, is the minimum required to complete this procedure. Review details about using the appropriate accounts and group memberships at http://go.microsoft.com/fwlink/?LinkId=83477.
|To add UPN suffixes|
Open Active Directory Domains and Trusts. To open Active Directory Domains and Trusts, click Start, click Administrative Tools, and then click Active Directory Domains and Trusts.
In the console tree, right-click Active Directory Domains and Trusts, and then click Properties.
On the UPN Suffixes tab, type an alternative UPN suffix for the forest, and then click Add.
Repeat step 3 to add additional alternative UPN suffixes.
- To perform this procedure, you must be a
member of the Domain Admins group or Enterprise Admins group in
Active Directory Domain Services (AD DS), or you must have
been delegated the appropriate authority. As a security best
practice, consider using Run as to perform this procedure.
For more information, search for "using run as" in Help and
- UPN suffixes should conform to DNS
conventions for valid characters and syntax.
- You can also perform the task in this
procedure by using the Active Directory module for Windows
PowerShell. To open the Active Directory module, click
Start, click Administrative Tools, and then click
Active Directory Module for Windows PowerShell. For more
information, see Add User Principal Name Suffixes (http://go.microsoft.com/fwlink/?LinkId=137827). For
more information about Windows PowerShell, see
Windows PowerShell (http://go.microsoft.com/fwlink/?LinkID=102372).