Apple focuses on proprietary hardware and software integration to drive loyal customers between its products. Google believes future revenues will come from in-app advertising and provides an open Android platform and app store. Microsoft aims to integrate its Windows operating system across all devices, changing the industry dynamics. Mobile computing is important for delivering internet access anywhere, and companies are battling over app stores, standards, and control of the user experience. Google's business model of free services supported by advertising has the greatest potential for long term success due to its early leadership in apps and services across hardware, software and experiences.