I cant seem to find the reason for it but i have a exchange 2013 server up and running. Users cannot seem to loing with there email address firstname.lastname@example.org but they can login with domain\username just fine.
Does anyone know why this would be or what i can check to try to resolve this? Outlook defaults to the email address for login which causes a lot of questions to be directed at me.
This is Exchange 2013U1 running on Server 2012.
Clients are using Outlook 2010 and 2013