Outlook Express 6 Cannot Import Outlook Msgs

I have Outlook Express 6 in XP Pro, and need to import my
old emails from Outlook under NT.

In Outlook Express 6, under File | Import | Messages,
Outlook is an option, but when I select that, and go Next,
I get an error message "Messages cannot be imported from
the MAPI client. An error has occurred." This is within
the import wizard, and I have not even gotten to provide
the location of the old messages.

I downloaded and installed SP1, but did not make any
differene. Anyone has any idea? Thanks.