Outlook import helped me import Windows Mail (the mail client on Vista) .eml files to Outlook (on Win XP). As you can see, mine is a curious case. I moved to an older OS but a more sophisticated mail client. Microsoft tools being what they are, I could not find a way to point Outlook to the Windows Mail files in order to do an import. Outlook import did this seamlessly. Even the folder organisation was preserved. What I like the most is that it allows you import to your present .pst file or create a new one.