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Ok so if i am understanding this correct you have 3 options?<br />
1) domina\username<br />
2) username<br />
3)email address (based of userPrincipalName)<br />
<br />
Now in our case we can actually just use username and that is going to work just fine. &nbsp;But i did test with using email address. I looked up the userPrincipalName for some users withing our domain and they all are usernam@domain.local non of them our our email domain. Do i have to go through each user and add that to them or does the KB you posted for adding the domain.com as a kind of sub option?
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Ok so if i am understanding this correct you have 3 options?
1) domina\username
2) username
3)email address (based of userPrincipalName)

Now in our case we can actually just use username and that is going to work just fine.  But i did test with using email address. I looked up the userPrincipalName for some users withing our domain and they all are usernam@domain.local non of them our our email domain. Do i have to go through each user and add that to them or does the KB you posted for adding the domain.com as a kind of sub option?

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It's pretty much a user by user thing. You could probably script it if you'd like :)
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It's pretty much a user by user thing. You could probably script it if you'd like :)

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

Exchange 2013 users cannot login with email but can domain\username

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.