Hyperlinks - Outlook 2000 and AOL 6.0

[Arualkwah]

One of my co-workers uses Outlook 2000 and Internet Explorer 5.0 at work, but at home he uses AOL 6.0. This is dandy, except when he clicks on hyperlinks in his Outlook email. When someone sends him a hyperlink at work, he clicks on it and it opens AOL, even if I.E. is already open.
:-0
Does anyone know where that little bugger is to set all hyperlinks to open in I.E.?

Thanks.

Arualkwah