Earlier quoted context omitted.
Ballmer ruined the company, not turned it around. He took something amazing and tanked it. Nadella is the example here.
This is often stated, but when you actually look at his accomplishments (from Wikipedia): > Under Ballmer's tenure as CEO, Microsoft's annual revenue surged from $25 billion to $70 billion, while its net income increased 215 percent to $23 billion, and its gross profit of 75 cents on every dollar in sales is double that of Google or IBM. ... > Ballmer also built half-a-dozen new businesses such as the data centers di…
MSFT Market cap when Ballmer announced he was leaving: $270B
That was the problem... even if the initial valuation was ridiculously inflated by the early tech bubble, post-crash, the stock was pretty stagnant throughout his tenure as CEO.
http://fortune.com/2013/08/23/steve-ballmers-market-cap-prob...