I am using Outlook 2007 to connect to our Exchange 2003 server.
Works fine in the office while connected to the LAN.
Works fine over the Cisco VPN when using a 3G dongle.
Does not work when connected to the VPN using my home internet connection. All other systems are accesible, I can ping the server, and use Outlook Web Access fine.
Outlook hangs for a couple of minutes when opening and eventually says 'cannot connect to the exchange server'.
Any ideas what the problem could be? Seems particularly strange that the Outlook - Exchange connection works fine when the VPN is established using my 3G dongle, but not when using my home internet!