If you look at the history of computing, very few companies manage to resurrect falling fortunes to lead their respective markets. Does this mean that once down, a company should resign itself to being out?

Apple is a famous example of a come-from-behind victory, but also a poor one: while it wins plaudits for its sexy MacBook Pro laptops, it still commands less than 10 percent of the personal computer market. Good, but not great.

In browsers, Firefox was left for dead years ago, only to get a new life and 22 percent market share. But Mozilla executive Mitchell Baker is quick to call Firefox's resurgence against Microsoft an "anomaly."

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