MSN Top Executive Left

In the United States, MSN is ranked 3rd on the search engines market, but with its share of around 10%, I wouldn't call it "one of Microsoft's greatest achievements". In fact, MSN is in a continue fight for survival, and I don't think the fact that its top executive just left is going to help, either...

Usually, when top management people are leaving for smaller companies, something is not right. Exactly the same happened here, since MSN's media network top executive Joanne Bradford is leaving for an advertising startup company based in Los Angeles, Spot Runner.

At least from the outside, this seems to have been a leave "without broken bones", since Satya Nadella, new senior vice president in charge of Microsoft's search, portals and advertising platform, said "We thank her for her many contributions in helping us build a world-class advertising sales organization, bringing the advertiser point of view closer to Microsoft and evolving the MSN experience through partnerships and branded entertainment."

Is it possible for Microsoft to lack vision so much, that its people are leaving for more flexible companies? Bradford says "I'm thrilled about joining such a visionary and entrepreneurial team," so I guess this may be the problem, but it's only my guess. What do you think about this? Is Microsoft incapable of keeping up with the rest of the industry's ever-changing business model and vision, or not?