For sometime now, new rumours about Microsoft trying to sell off its Bing search engine pop up. At some point late last year, the word on the street was that if then-CEO candidate Stephen Elop would take the reins of the company, he would sell Bing as soon as possible. After last week’s Build developer conference, we can now put those rumors to rest. Bing is now a core part of Microsoft’s strategy, and there is no way it could sell Bing without disrupting many of the services it has recently built. Especially the Cortana.