Why IBM just lost three key executives

Executives come and go at any large organization, but when the company in question is IBM -- and when it loses three high-ranking executives in a single month -- it's only natural to wonder what's going on.That, in fact, is just what apparently happened at IBM in December, when it reportedly lost Steve Mills, the 43-year company veteran who was most recently executive vice president of IBM Software and Systems, along with Danny Sabbah, its chief technology officer for cloud, and Brendan Hannigan