By Sumeet Chatterjee MUMBAI (Reuters) – In his university days in India, Satya Nadella, likely the next chief executive officer of Microsoft Corp, was a relentless questioner. When all other students will quietly listen to what I would teach, he will ask a lot of questions – why does it have to be like this, why cant we do it like this?, said Harishchandra Hebbar, who taught digital electronics to Nadella at Manipal University. That questioning nature has served Nadella well in his 22-year career at Microsoft, the worlds largest software company. His elevation to the top spot at Microsoft would end a five-month search for a tech-savvy heavy-hitter to lead the company co-founded by Bill Gates.