Check that the user is not locked out.Read the Knowledge Base article on What Is The Difference Between Disabled Users, Deleted Exchange Mailboxes And Deleted Users? for more information. Check that the user is enabled (not disabled).Read the Knowledge Base article on How Do I Create New Mailboxes On Exchange Accounts? for more information. Check that the user has Exchange services enabled.Try to login to other services with User credentials: Please note that credentials for your Administrator account and User account might be different.
If you are not able to login to OWA, try the steps below:
