View Mail Source
Using Outlook 2003 you can view the header and source together, if you edit a registry key. This works on mail obtained from Internet mail transports, not Exchange server mailboxes. However, if you access the mailbox using an Internet transport, you’ll see the full source.
Open the registry editor and navigate to:
HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook\Options\Mail
right click on the right pane and choose new DWORD:
Parameter: SaveAllMIMENotJustHeaders
Value: 0×00000001
