HTTP email accounts won't connect to server?

We are setting up some HTTP accounts (Hotmail and MSN) at home in Outlook
2007. Comcast is the IP broadband provider at our home and we have
successfully set up all our Comcast POP3 email accounts in Outlook 2007.
However, none of our HTTP Hotmail or MSN accounts will connect to the mail
servers? Can't figure it out, we have set them up just as we have in our
office in Outlook 2007, but over a Qwest DSL service line. It does not seem
to be a random setup error since all the POP accounts work, while none of the
HTTP accounts work. We have even disabled our firewall for a few minutes to
see if that was the problem, but it does not appear to be the problem. Any
suggestions?