I'm looking for a solution to trigger an action.

In fact, here is what I want :
- a user create an appointment in his calendar
- the "CreateAppointmentRequest" do the job
- a new service "CreateAppointmentThirdParty" create this appointment via WebService/SOAP in another application.

The difficulty is the way to create this call in Zimbra.
What's the good way to proceed with Zimbra ?

Thanks for your responses,

Daniel SERY.