Authenication changed to for OWA user logon. Users can not login

Question

When visiting our OWA page, users would log-on with their username.
There was many requests to change it to email address, so I changed the authentication type under Server Config>Client Access>OWA site
Previously it was set as "user name only" and I changed it to "User Principal Name (UPN)"
It worked that when you were at the OWA page, it would ask you for your email address...only entering your email address and password did not work.  I could not get it to work for any users.
My question.  Where is it getting the logon "email address" credentials?  Is it getting it from the users reply to email address?  It does not seem to be...
Advice would be appreciated.

Answer 1

Hi,
Open Active Directory Domains and Trusts.
Right-click Active Directory Domains and Trusts in the Tree window pane, and then click Properties.
On the UPN Suffixes tab, type the accepted domain used in your email address.
Now when you can select the new UPN  suffix from Active directory users and computers->User properties->Account tab. Select the required account details. Now you can be able to login using the email address
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