Currently in the process of migrating from Exchange 2007 to Exchange 2013, everything is working as expected, except outlook clients are prompted for username and password.
To explain further. We have a split DNS configuration as we have a non route-able internal domain name (domain.local). Split DNS is configured as follows:
mail.domain.com internally points to the exchange 2013 server
mail.domain.com externally points to the external address of the 2013 server which is behind a firewall.
We have a secure certificate with mail.domian.com and autodiscover.domain.com installed and OWA and Active sync are all working as expected.
All the virtual directories are configured both externally and internally to match mail.domain.com so we don't get any certificate warnings internally etc.
When I set up a test mailbox on Exchange 2013 and then set up a clients outlook, autodiscover goes off and finds the account and then tries to authenticate. The problem is that outlook tries to log in with the following account:
email@example.com - which is the users email address not the users AD account.
In order to get the user connected I have to change the login to firstname.lastname@example.org
How can we get round this problem so that outlook doesn't need to prompt for the username and password?
Thanks in advance.