From inside Mac Mail select all of the e-mail message you wish to export.
Select File > Save As
Change the format to "RAW Format"
Once the file is done saving, transfer it to a windows PC
Rename the file to mail.mbox
Download and Install IMAP Size - www.broobles.com/imapsize/download.php
From IMAPSIZE go to Tools > mbox2eml...
Select the location for the converted messages
Once the conversion is done Open Outlook Express
Select all of the converted messages in Windows explorer and drag them to the Outlook Express Inbox
Once the messages all appear in Outlook Express open Outlook 2003/2007
File > Import From another Program or File > Outlook Express ......
Walla, Mac Mail moved onto your Exchange Server
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