The API is the Outlook object model. Use the ItemAdd event for that
particular Calendar folder's Items collection. There are some C++ samples
for Outlook coding at www.outlookcode.com and some in the MSDN library but
there are a lot more samples for VB/VBA.

--
Ken Slovak
[MVP - Outlook]
http://www.slovaktech.com
Author: Absolute Beginner's Guide to Microsoft Office Outlook 2003
Reminder Manager, Extended Reminders, Attachment Options
http://www.slovaktech.com/products.htm


wrote in message
ups.com...
Hi all,
I am writing a small C application which needs to respond to the
event generated when an appointment is created in outlook calendar. So
I want to know if there is anyway of getting this information from
outlook, perhaps, some API... Some C code snippet giving an example
will be most helpful.... Thank you