Under Ballmer, Microsoft had a brief identity crisis, trying to be a vertically integrated company like Apple. It is clear that Satya Nadella is taking Microsoft the other way to become a horizontally-integrated company like Google (http://stratechery.com/2013/understanding-google/)by open-sourcing .Net platform, to support competing platforms like Linux, releasing Office and Outlook on all mobile platforms (Windows, iOS, Android), focusing on cloud services, and deprioritizing Windows.