Inserting Email signature in outgoing email from Nav 5.0

On Contact cards in Relationship Management, there is an icon beside the Email Address field. When selected, it loads a new/unsent email message using the client's default email program and fills in the "To" address with that of the Contact.

In this case, the email client is Outlook 2003 (on all work stations) and everyone makes use of a lengthy signature that is saved in Outlook and defaults to the bottom of new messages... unless the new message is launched within NAV.

How can I have the system to insert the signature that is saved in Outlook into the email body? ](*,)