Change OWA Logon Format to UPN on Exchange 2007/2010

To change the logon screen of your OWA website to ask for the user principal name (UPN) or email address instead of “Domainuser name”, change the following to “User principal name (UPN)”. To access this screen, from within Exchange Management Console, go to “Server Configuration>Client Access”, right click the OWA website listed under the “Outlook Web App” tab, select properties, and click the “Authentication” tab:

Before:

After:

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