I am connecting to Outlook at office using my LAN cable. Since, we have
browsing restrictions, we are using a USB Modem to connect to internet.
Outlook starts okay connecting to the mail server using LAN cable. But, once
I turn-on the USB Modem (for browsing), outlook looses the connection. I have
to stop the USB Modem for outlook to re-connect.

Is there any way I can specify which connection Outlook must use to connect
to the exchange server?