Example application showing how to implement EWS Push Notifications in a standalone application (i.e. not needing IIS). This example uses WCF and subscribes for notifications on the calendar folder of the specified user.
I have written another sample application that does not use WCF and also integrates better with the EWS Managed API. Please see here:
Additionally, SOAPTestApp (http://soaptestapp.codeplex.com/
) also supports push notifications and many other EWS functions, working at the SOAP/XML level (so useful for testing without any APIs).