Einhorn Adds to Drumbeat for CEO Exits With Call to Oust Ballmer

David Einhorn’s call to replace Microsoft Corp. Chief Executive Officer Steve Ballmer adds to the drumbeat for change at the top of technology bellwethers.

Boards at increasingly large hardware and software makers are replacing CEOs to help their companies repel threats from upstarts such as Facebook Inc. and Apple Inc. The aim is to keep from getting left behind in emerging technologies including social networking, mobile computing and the delivery of software over the Internet, via the so-called cloud.