Please view this wonderful Screencast from channel9, which easily we can able to create our own menu option to the context menu in Outlook.

Per jwiese "...would you like to add your own menu option to the context menu in Outlook?  How about turning an email into a new meeting request without having to type in all the attendees or the body and subject?  Well, in this Screencast I'll show you how to add to the context menu and generate a meeting request that includes the email's recipients, subject and body in the meeting details..."