Outlook 2010 automatically filling in the wrong username and not remembering passwords

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http://serverfault.com – I have a SBS2011 server with an internal domain name: mydomain.local. The external address is different: myexdomain.com. When connected over the VPN and a user opens Outlook, it will prompt for a username and password. The username is already set to their email address [email protected] However this is incorrect as their username should be mydomain\username. Even if we tick remember password, next time Outlook is opened over the VPN the credentials are asked for, and again the username is set incorrectly as the email address. What are the reasons for this and is there anyway to pr (HowTos)