You can't. See http://www.outlookcode.com/d/forms/appointmentform.htm

--
Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
http://www.turtleflock.com/olconfig/index.htm
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx

"blanc" wrote in message news
I'm interested at adding some controls in the standard appointment form.
But when I open the appointment form and chose "design this form", I can't
modify anything in the first slide "appointment". so how to add some controls
in the "appointment" slide?