We have 4 different companies using the same Exchange server and they all have different e-mail domains. The problem I am having is that they are not able to log in to OWA in less the parent domain e-mail address is listed on there user properties. Here is an example of what I am talking about
Here is the user when OWA is not working
and this is the same user fixed
How can I configure these users to be able to sign in to OWA but not have to have an e-mail address the same at the parent container?