How can email internet headers be retained when rendering MSG files to PDF?

I am using Acrobat X Pro and it is a simple task to create a PDF rendition of an Outlook email message, either directly from Outlook using the Acrobat plug-in or by saving as an MSG file and then converting to PDF. However, all of the internet header metadata within the MSG file is lost. I've been told by someone from the PDF Association that it is possible to retain the internet header data when converting Outlook emails to PDF but cannot see how this can be done with Acrobat X Pro. Is this only possible with Acrobat XI or is another product or plug-in needed?