The CourierService is no longer a preferred way to communicate with clients.
Delivery is the core interface for things sent to the Courier service that represent various sorts of deliveries to the client windows.
Interface that will be used in additions to Delivery to indicate that a delivery will eventually expire.
ObservingCourier is an observer which uses the courier service to notify when things change.
The PresenceUpdater interface is a simple mechanism to access the PresenceService without a cross-module dependency.
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