Upgrade to SP2 has wiped out old Outlook Express Address Book

From: djennison (djennison_at_yahoo.com)
Date: 08/23/04 

Date: Mon, 23 Aug 2004 13:33:40 -0400

I just upgraded XP with service pack 2 and have lost all my old e-mails and
old address book. Hundreds of addresses could be lost. Are they somewhere
else on the hard drive?