Despite licensing the proprietary ActiveSync Exchange Server protocol from Microsoft for use with the iPhone, Apple is building its own Push Notification Server for messaging services in both the iPhone and Mac OS X Snow Leopard Server using open, interoperable standards.

However, the company's pioneering, yet protracted leap into push messaging indicates that notification technology can be more complex that it seems, having delayed Apple's intended deadline for shipping PNS by many months.

The push for push messaging

Push messaging relates to information that is sent immediately rather than queuing up on a server, waiting to be picked up.

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