An apparatus, system, and method are disclosed for assuring delivery of an Enterprise Information System (EIS) event to a client. An adapter apparatus polls at least one EIS for an event. The event is staged to a staging table, consisting of an XA-compliant database, in preparation for delivery to the client. The status of the event is marked and the event is delivered to the client. Events delivered to clients that are unresponsive or otherwise unavailable are held until the clients become responsive and then the events are delivered. Delivery of events is confirmed using a transaction service.