Hi
What I wold do is :
-create my new email account in the new install
-look for any file with a "dbx" extension in the old system
(you can choose the last modified files in your search conditions)
-note the directory where the files are being found
-launch my new mail and make an import from stock location, browse till the import points to the directory you found in the above
-click ok and choose the folders to be restored, and you should be done.
This works with Windows 95 and Outlook express 5.xx
Good luck.