"Email messages
Different email programs use different methods of storing messages. We’ve collected some useful links to help.
Microsoft Outlook and Outlook Express use a proprietary format for storing messages. Microsoft’s web site has a tutorial on how to transfer email files. Or you could invest $10 in Little Machines’ Outlook2Mac (compatible with Microsoft Outlook only, not Outlook Express)."
http://www.apple.com/switch/howto/ipod/How to Use IMAP to Move Messages Between a PC and a Macintosh in Entourage, Outlook, or Outlook Express
http://support.microsoft.com/default.aspx?scid=kb;en-us;311129Outlook2Mac
http://www.littlemachines.com/I hope that this will help you.