It's an interesting interview, from Fortune magazine, encompassing primarily the successes, but also touching on some of the expensive failures under his tenure.

But in a recent interview with Fortune, he adamantly insisted he got more right than wrong during the 13 years he ran Microsoft.Microsoft's Steve Ballmer Believes He Got More Things Right Than Wrong [tech.fortune.cnn.com]

Under Ballmer, Microsoft's profits doubled, revenues tripled. "In the last five years, probably Apple (AAPL) has made more money than we have," Ballmer says during a sit-down in his office in Redmond, in what's expected to be his final press interview as CEO. "But in the last 13 years, I bet we've made more money than almost anybody on the planet. And that, frankly, is a great source of pride to me."