EWS Managed API
Cancels the meeting and sends cancellation messages to all attendees. Calling this method results in a call to Exchange Web Services (EWS).
Assembly: Microsoft.Exchange.WebServices (in Microsoft.Exchange.WebServices.dll)
Return valueType: Microsoft.Exchange.WebServices.Data.CalendarActionResults
A CalendarActionResults object that contains the various items that were created or modified as a result of this operation.