To the saccharine rhythm of a Muzak clip, Steve Ballmer crouched into a tackling stance and dashed across a ballroom stage at the Venetian Las Vegas. A 20-foot wall of video screens flashed his name as the 55-year-old Microsoft chief executive bear-hugged Ryan Seacrest, the ubiquitous television and radio host, who had just introduced Ballmer’s keynote speech for the 2012 International Consumer Electronics Show.

More than 150,000 techies and executives were swarming the city’s hotels last January in the annual bacchanalia of cutting-edge gizmos and gadgets. Attendees ran from one vendor to the next, snapping up fistfuls of freebies, inhaling flavored oxygen, and rubbing elbows with stars such as LL Cool J and Justin Bieber.

But this night, an air of discomfort filled the Palazzo Ballroom, where Ballmer was about to give the show’s opening presentation, one delivered by Microsoft’s C.E.O. for 14 of the previous 17 years-the first 11 by Bill Gates and the rest by Ballmer. Weeks earlier, the company had declared that this would be its final keynote-and, worse, that it wouldn’t even be back next year as an exhibitor to showcase new innovations. The timing for big news about its products, it said, didn’t match that of the […]