By setting the Mail key and SaveAllMimeNotJustHeaders in registry for POP3 account on Outlook 2007, I'm not able to get X-Originating-IP header field. After setting the registry key, outlook downloaded the html source too of the new emails, but not all the header fields. In Outlook OWA (outlook website), I can see the X-Originating-IP of emails. But how can I get this X-Originating-IP header field in Outlook desktop 2010?