Force Outlook To Use Specific Net Connection

[cmosdos]

While at work, I have a high speed account that I use for email and http access. However, there is a program that I must access by using a dial up account pretty frequently. When I dial into this service (leaving the high speed account still hooked up) the dial up account works fine. But, for some reason, Outlook decides to start using the dial up account. Unfortunately this will not work because our email is routed through an MS Outlook data server. As you would expect, I get an error popping up that says it can't access the server. I can get around this by using a different smtp account, but my emails range anywhere from 300K to 4mb a piece. Its a very painful experience.

Is there a way I can force Outlook to use the high speed connection? I have not been able to find an option to do so.