I have several user who travel and connect to our network using Citrix VPN. Once they are connected they can connect to our servers..etc. but when opening up Outlook they are greeted with a login window. No combination of usernames will allow Outlook to connect to the Exchange Server. If the user is in the office, the connect works just fine. Note: This is only a handful of users out of hundreds. I even tried a brand new machine but the issue still remains for these people. Any thoughts?