On a warm night in late October, Steven Sinofsky stood on a platform in New York’s Times Square, smiling as a huge crowd roared at the unveiling of a Microsoft retail store, where Windows 8 and the company’s new Surface tablet were about to go on sale.
Less than three weeks later, Mr. Sinofsky — who, as the head of Windows, was arguably the second-most important leader at Microsoft — suddenly left the company. His abrasive style was a source of discord within Microsoft, and he and Steven A. Ballmer, Microsoft’s chief executive, agreed that it was time for him to leave, according to a person briefed on the situation who was not authorized to speak publicly about it.
Mr. Sinofsky was widely admired for his effectiveness in running one of the biggest and most important software development organizations on the planet. But his departure, which Microsoft announced late on Monday, parallels in many respects that of Scott Forstall, the headstrong former head of Apple’s mobile software development, who was fired by Apple’s chief executive, Timothy D. Cook, in late October.
Both cases underscore a quandary that chief executives sometimes face: when do the costs of keeping brilliant leaders who cannot seem to get along with others outweigh the benefits?
The tipping point that led to Mr. Sinofsky’s departure came after an accumulation of run-ins with Mr. Ballmer and other company leaders, rather than a single incident, according to interviews with several current and former Microsoft executives who declined to be named discussing internal matters.
One example of the kind of behavior that hurt Mr. Sinofsky’s standing at the company occurred this year at a two-day retreat for Microsoft’s senior executives at the Semiahmoo resort on the coast just below the Canadian border in Washington State. At the meeting, Microsoft’s various division heads were expected to make presentations on their businesses, answer questions and remain to hear their peers repeat the exercise.
When Mr. Sinofsky stood on the first day to speak about the Windows division, he told the group he had not prepared a presentation, and if they wanted to catch up on the progress of Windows 8, they could read his company blog, where he publicly chronicled the software’s development. He answered questions from the audience and then left the resort, while his colleagues remained until the next day, according to multiple people who were present.
Mr. Sinofsky’s early exit and halfhearted presentation were widely noted by his colleagues, irking even his admirers in the company. “He lost a lot of support,” one attendee said.
It wasn’t until this Monday, though, that Mr. Sinofsky and Mr. Ballmer both decided it would be best if Mr. Sinofsky left. Bill Gates, Microsoft’s chairman, supported the move, a person briefed on the matter said. Mr. Sinofsky served as a technical assistant to Mr. Gates in the 1990s.
In an e-mail to Microsoft employees, Mr. Sinofsky said the decision to leave “was a personal and private choice.” Many surprised Microsoft insiders noted that Mr. Sinofsky’s departure was immediate, an unusual arrangement for someone with a 23-year track record at the company. A Microsoft spokesman, Frank Shaw, said Mr. Sinofsky was not available to comment.
Although Mr. Ballmer grew increasingly impatient with Mr. Sinofsky throughout the year, he held back from taking any action earlier to avoid disrupting the release of Windows 8, the most important product Microsoft has unveiled in years, a person with knowledge of his thinking said.
The final decision could not have come lightly. Although many people at Microsoft viewed him as a ruthless corporate schemer, Mr. Sinofsky ran the highly complex organization responsible for Windows as a disciplined army that met deadlines, and he was respected by people on his team.
He achieved hero status within Microsoft several years ago by taking over the leadership of Windows after the debacle that was Windows Vista, a much-delayed operating system whose sluggish performance and technical problems worsened Microsoft’s reputation for mediocre software. Mr. Sinfosky led the development of a new version of the operating system, Windows 7, which was positively reviewed and sold well.
“He did great things with Windows,” said Michael Cusumano, a professor at the Sloan School of Management at the Massachusetts Institute of Technology. “That’s still the core of the company.”
But while Mr. Sinofsky was effective, Mr. Cusumano said, he could be secretive and difficult to get along with, as he learned while dealing with Mr. Sinofsky while Mr. Cusumano was writing a book on Microsoft in the early 1990s. “I could imagine that he burned a lot of bridges and created a bunch of enemies,” he said.
