Your mailbox items are stored in personal folder .pst (if not using a server
mailbox).  This pst file can be copied to another system or you can use the
Export feature within Outlook.  I seem to have the best results just copy
the pst file over to the new system.  However this only copies the pst file
and does not keep them both "synched" so this would work for a one-time type
of move.  There are others options available as well - check out the link
below.

http://www.slipstick.com/outlook/share.htm

Regards,