Mobile is key to Microsoft strategy, Ballmer says

Microsoft Corp.'s software strategy a few years ago revolved around software that was either embedded on devices or burned onto CDs and shipped to users, he said. Today, however, software works in tandem with the Internet, which can back up and update the software.

The phone is particularly important in achieving Microsoft's unified view, he said. "The PC is the most powerful device, but the phone is the most popular," he said. Particularly in the developing world where PC's may be cost prohibitive, cell phones may be more widespread.

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