Ballmer on leadership changes aka voluntary retirements

“And I think i’ve been quite public about the fact that I chose to make a set of leadership changes in the team of people building and executing on our Windows Phone software.

“We had to do a little cleanup, change things around,” Ballmer said

via AppleInsider | Microsoft CEO hopes to reenter phone market, disputes PC shift.

“I chose to make leadership changes” and Robbie Bach the ultimate leader of Windows Phone “retiring”.  Did he jump or was he pushed?