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Add login domain to Active Directory

Adding another domain (UPN suffixes) to your active directory is simple:

Start the Active Directory Domain and Trusts MMC then right-click on Active Directory Domain and Trusts in the left pane (*not* on your domain name). Choose Properties and type in the UPN suffix (@domain.com) you want to use.

When you are creating a new user, select the UPN from the login domain dropdown.

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