See that little "FAQ" above your post, it is chock full of information about the ATT DSL service.
»AT&T Midwest/Ameritech FAQ
I guess I would stick with Outlook Express and what ever version of IE runs on 98SE. I have a feeling that latest versions my give you some grief, due to all of the features that added.--
The sooner we get behind schedule, the more time we have to catch up.