Like drag an email message to the calendar folder or to the Navigation pane's thumbnail calendars to open a new appointment form with the message in the appointment body? Sure.
Either drag or right click and drag. If you drag to the caledar folder, the default date is today or drag it to the navigation calendars to pick a date.
This quickie video shows dragging and then right click -drag to both the navigation calendars and the calendar folder.
[video]http://slipstick.me/jing/mail_appt.swf[/video]