Not possible if the appointment is in their mailbox or PST file, they own
that and have full rights to all items in those folders unless you use some
sort of rights management software. Put them in a delegate mailbox they only
have read permissions on or a public folder with read only permissions on it
for them.

--
Ken Slovak
[MVP - Outlook]
http://www.slovaktech.com
Author: Professional Programming Outlook 2007.
Reminder Manager, Extended Reminders, Attachment Options.
http://www.slovaktech.com/products.htm


"hemaneelagiri" u54138@uwe wrote in message news:9ae06cfd00f27@uwe...
hi i want to lock appointment which are created by my c# code.
those appointment should display in outlook but from outlook user can see
that appointment but can't change that appointment

Thanks