Our SharePoint Portal Server 2003 website can be access through the internet ( I go to this link, SharePoint will open a username/password popup box. If I put in simply my username and password, it won't let me in. If I put in my server domain and username (domain\user) with my password, it will let me in fine. The problem with this is 90% of the users don't know our internal Microsoft Domain, and we don't want to make them sign in this way. Any thoughts?