Baidu Challenger's Search and Destroy Mission

(Beijing) – A software company that morphed overnight to challenge China's dominant search engine Baidu – which the rival's chief executive blames for the industry's "greatest damage" – has adaptability in its blood.

But the flexible business strategy that built Qihoo 360 Technology Co. and its 360sou search engine is at the center of commercial row with Baidu, legal threats, stock sell-offs and a backlash from critics who question the company's technology.