Nokia is replacing its CEO, Olli-Pekka Kallasvuo, with a top Microsoft executive, Stephen Elop, as the Finnish handset manufacturer seeks to make up for ground it has lost in recent years to rivals such as iPhone-maker Apple and BlackBerry-maker Research In Motion. But already a senior Gartner analyst is questioning the move. “I’m in two minds about this,” says Gartner vice-president Nick Jones.