Hyperlinks Don't Work In Outlook
            Express
            After uninstalling another web browser such as
            Netscape, you may find that clicking a link in Outlook Express may
            not work if the removed program is still considered to be your
            default browser. Start Internet Explorer, goto View,
            Internet Options and select the Programs
            tab. Make sure the message "Internet Explorer should
            check to see whether it is the default browser" is
            checked. If not, then check it! Press Okay and
            close Internet Explorer.
            If this doesn't apply to you, try following the
            steps at Microsoft
            Knowledge Base Article Q177045 (Internet Shortcuts in Outlook
            Express Don't Start Browser).
            Note: Tip originally came
            from IE
            Info Center