Broadcast push notifications to millions of mobile devices using Windows Azure Notification Hubs

Push notifications are a vital component of mobile applications.  They are critical not only in consumer apps, where they are used to increase app engagement and usage, but also in enterprise apps where up to date information increases employee responsiveness to business events. Sending a single push notification message to one mobile user is relatively straight forward (and is already incredibly easy to-do with Windows Azure Mobile Services).  Efficiently routing push notification messages to thousands or millions of mobile users simultaneously is much harder – and the amount of code and maintenance necessary to build a highly scalable, multi-platform push infrastructure capable of doing this in a low-latency way can be considerable.