Microsoft's strategy focuses on building best-in-class platforms and productivity services for a mobile-first, cloud-first world. The document analyzes two of Microsoft's main strategies: 1) social responsibilities and 2) their strategic alliance with Yahoo. For social responsibilities, Microsoft partners with community colleges to address the shortage of skilled IT workers and improve technology education. For the Yahoo alliance, Microsoft will use Yahoo's core search technology and become the main seller of Yahoo's search ads, while Yahoo gives up control of its search business.