Upgraded Outlook Express and My stuff got lost

I just upgraded my IE 4.0 using the online center at microsoft. With IE my Outlook Express automatically upgraded. While my Explorer suffered no problems, when my new Outlook Express was logged on, I can no longer find my address book and folder contents. I doubt that it erased everything, but where could it be?

P.S. My older version was IE 4.0

take a look for *.idx and *.mbx. Those are your emails. If you find doubles...loook for the smaller files and replace them with the bigger files. That will fix it.
your address book is *.wab

Good luck!

Steve