The COM+ events service is used to manage the delivery of events from publishers to subscribers. The COM+ queued components service can be used to make the publisher and subscriber processing time independent by queuing the publisher's message and later replaying it to the subscriber. Whether or not you need to use the queued components service depends on the underlying business logic of your application. If you need to have events that are time independent, you can create them by using the COM+ events service with COM+ queued components service.