You do your homework in the object browser: Press ALt+F11 to open the VBA
environment in Outlook, then press F2. Switch from <All Libraries> to
Outlook to browse all Outlook objects and their properties, methods, and
events. Select any object or member, then press F1 to see its Help topic. If
you searched for "RTF" or "HTML," you'd probably have found it.
--
Sue Mosher, Outlook MVP
Author of
Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers