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Add alternative UPN suffix in Active Directory

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I'm currently working on converting "In cloud" Office 365 accounts to Active Directory synced accounts. As a step in the process, I had to match the UPN suffix to match the "Username" or SMTP Value in Office 365.

Open the Active Directory Domains and Trusts snap-in.

In the left pane, right-click Active Directory Domains and Trusts and select Properties.

Under Alternate UPN suffixes, type the name of the suffix you want to add.

Click Add and OK.