For Microsoft, 2006 was a year of new product introductions: the Windows Vista operating system, a new version of Office, and the Zune music player, to name a few. Microsoft CEO Steve Ballmer’s job: Convince customers that Microsoft’s latest products are ground-breaking enough to purchase, transform a company with $44 billion in sales into an agile innovator, compete against new business models that challenge Microsoft’s traditional approach to software development and recruit enough talent to keep the software giant relevant 25 years from now. Ballmer joined Microsoft in 1980, five years after its inception. He has witnessed the company grow from 30 employees to almost 80,000. In 1998, he was named president of Microsoft, responsible for day-to-day operations, and two years later was named CEO. With a management style that he characterizes as “more bubbly” than most, Ballmer says leadership “requires a heavy degree of personalization” and the ability to adapt to new conditions.…