Microsoft (NASDAQ:MSFT) CEO Satya Nadella hasn't been on the job for two months yet, but he is apparently full of large ideas about how he wants the company to run under his leadership. According to Re/code, which cited unnamed sources, Nadella largely impressed about 120 senior executives who gathered for an offsite meting recently, the first at which he was in charge. The report said Nadella spoke about Microsoft's challenges more candidly than usual, and said the company's employees need to behave more like "challengers" than followers. That's especially true in mobile, where Microsoft is working hard to get its Windows Phone platform to catch up to Google (NASDAQ:GOOG) and Apple (NASDAQ:AAPL) in smartphones and tablets. Article