MS Exchange Server/EWS - When does it send calendar notifications?

Question

I'm working on an application with Exchange using EWS Java. I would like to subscribe exchange server with push notification to get calendar events. I am just at the beginning of researching but could not find exact info about an issue.

I want to learn the presence status of the user according to his calendar data. As I understand from articles, when a user accepts a meeting, a notification will be sent to the application. Is there any other notification, when this meeting starts or ends? How can I know this user is busy/free at the current time? When does the exchange server send its push notifications exactly?

Thanks.

Answer 1

Regarding your question How can I know this user is busy/free at the current time?

GetUserAvailability Operation will help you
reference link http://msdn.microsoft.com/en-us/library/exchange/aa564001%28v=exchg.80%29.aspx

Answer 2

In exchange-2010, they have added a new EventType which you subscribe to : EventType.FreeBusyChanged