The interview I quoted, on the other hand, is full of stories over how MS lost its way.
http://www.vanityfair.com/business/2012 ... ve-ballmerAt the center of the cultural problems was a management system called “stack ranking.” Every current and former Microsoft employee I interviewed—every one—cited stack ranking as the most destructive process inside of Microsoft, something that drove out untold numbers of employees. The system—also referred to as “the performance model,” “the bell curve,” or just “the employee review”—has, with certain variations over the years, worked like this: every unit was forced to declare a certain percentage of employees as top performers, then good performers, then average, then below average, then poor.
“If you were on a team of 10 people, you walked in the first day knowing that, no matter how good everyone was, two people were going to get a great review, seven were going to get mediocre reviews, and one was going to get a terrible review,” said a former software developer. “It leads to employees focusing on competing with each other rather than competing with other companies.”
Supposing Microsoft had managed to hire technology’s top players into a single unit before they made their names elsewhere—Steve Jobs of Apple, Mark Zuckerberg of Facebook, Larry Page of Google, Larry Ellison of Oracle, and Jeff Bezos of Amazon—regardless of performance, under one of the iterations of stack ranking, two of them would have to be rated as below average, with one deemed disastrous.
For that reason, executives said, a lot of Microsoft superstars did everything they could to avoid working alongside other top-notch developers, out of fear that they would be hurt in the rankings. And the reviews had real-world consequences: those at the top received bonuses and promotions; those at the bottom usually received no cash or were shown the door.
Seems like Ballmer instituted a system that made it certain that the "lower performing" 10% of each group would be punished, even if they did a great job. The standard procedure became of one to protect its back, and not on how to do the best for MS.