This document discusses the impact of mobile computing on IT. It notes that mobile devices are ubiquitous now and user expectations have changed, demanding access from anywhere using consumer-grade technologies. This is forcing massive changes on IT. New device platforms like smartphones and tablets beyond just Windows are used, along with new apps designed for these platforms. The document outlines trends in mobile operating systems like the dominance of Android and growth of iOS. It also discusses challenges of managing devices, apps and data in a secure way across diverse platforms.