Error 80048820: You can’t sign in to Windows Live Messenger
You may not be able to sign in because of a problem with Internet connectivity, your firewall (A security feature designed to help protect a computer from unauthorized external access. It can be hardware, software, or both.) , date and time settings, proxy settings, security settings, or SSL security. The server may also be temporarily unavailable.
You’d think, with an eight digit error ID, they could be a bit more specific.