The Wall Street Journal has a lengthy article about an internal riff between Bill Gates and Steve Ballmer back when Gates first handed over the reigns at Microsoft:

One of the most successful business partnerships in history was coming unraveled. It was early 2000, and Bill Gates had relinquished the chief executive's job at Microsoft to Steve Ballmer -- for the first time taking a back seat to his college pal and right-hand man of 20 years.

Mr. Ballmer got the title. But Mr. Gates retained the power, triggering a yearlong struggle between the two men that until now has remained largely under wraps.

Things became so bitter that, on one occasion, Mr. Gates stormed out of a meeting in a huff after a shouting match in which Mr. Ballmer jumped to the defense of several colleagues, according to an individual present at the time. After the exchange, Mr. Ballmer seemed "remorseful," the person said.

The conflict between the two men paralyzed business-strategy decisions that the company still wrestles with today. Board members stepped in to try to mediate a truce.

More interesting, perhaps, is the edited transcript of the interview that led to this article.