We are running Exchange Server 2010, we have users on the domain that are capable of accessing the server through outlook 2010 without any issue. We also have users that are not on the domain, using Outlook 2010. When they try and connect on or off the domain, they receive a windows securing box telling them trying to connect to.... with an "ok" box that is grayed out and a cancel button that you can click. Once outlook loads, it states that it needs a password or that it is disconnected. We have attempted putting the mail server with the users username and password in the credential manager, but it does not work.