Microsoft Office Tutorials and References
In Depth Information
Remediating the UPN suffix
Figure 3-16 Adding an alternative UPN to the forest.
4. Click OK.
Now that you have added an alternative UPN to the forest, it will appear as an option in
the user logon name settings in the Active Directory User and Computers (ADUC) MMC
when you create a new user, as shown in Figure 3-17. All the UPN suffixes listed here will
be associated with the user logon, but the one that is selected is known as the default UPN
suffix. The default UPN suffix is the one that will be used by the Directory Sync tool to
create the user in Office 365, so it is important to select the correct default UPN suffix when
creating the user.