Another ex-Microsoft executive with CEO experience, Maritz is best known as the chief executive who led VMware from a small virtualization company into an IT industry leader. But he also is a Microsoft veteran, most recently serving as executive vice president of the Platforms Strategy and Developer Group. He later founded and ran software startup Pi Corporation, which was acquired by EMC in 2008. After serving as head of EMC's cloud business, Martiz was tapped by the storage company as CEO of VMware. Martiz has deep experience with cloud and virtualization technology -- two key areas for Microsoft.