Jason Henderson announced in his Exchange Developer Roadmap blog post that Microsoft is officially deprecating, among other things, Store Event Sinks and SMTP Event Sinks. This means that Exchange developers will have to rely on Exchange Web Services (EWS) notifications and transport agents to perform many of the tasks previously handled by these event sinks. To help with the transition, I’m going to discuss how to manage the notification subscription lifecycle. Specifically, I’m going to focus on push notifications. I’m going to assume that the reader is familiar with both the Notifications documentation that is available on MSDN (Event Notifications) and the Exchange Web Services API. Also, Inside Microsoft Exchange Server 2007 Web Services is a great book that was written by some of the people who developed Exchange Web Services and has a lot of detailed information on this and other topics.