Outlook Express

I just performed a Windows XP upgrade on a 98 machine, and in the upgrade it didn't move their emails from OE6 in 98 to OE6 in XP. I still have a copy of her hard drive in its 98 format, and need to burn the files that has her messages to CD and take them to her location and Import the messages into OE6 for XP...

What files do I need to burn??? If I remember it is the *.mbx files, but its been a while.