Specifying the notification communication method

You can specify that the NexJ application server use streaming or push notifications to receive updates from user folders on Exchange Server.

Note: Exchange Server 2013 and Exchange Server 2016 support either streaming or push notifications. Exchange Online only supports streaming notifications and Exchange Server 2010 only supports push notifications.

Streaming notifications: The NexJ application server subscribes to a folder on Exchange Server and opens a streaming connection. Notifications are received by the NexJ application server as a response on that connection. You must enable the Autodiscover service to use streaming notifications.
Push notifications: The NexJ application server subscribes to a folder on Exchange Server and provides a callback URL, for example https://<host>/nexj/anon/channel/ExchangeEWSNotificationReceiver, for Exchange Server. When user folders are updated, Exchange Server posts a notification to the NexJ application server.