Ballmer did well product wise. Azure, xbox, office 365, bing and surface were started under him. His big losses were the smart phone and search engine. If you

Ballmer did well product wise. Azure, xbox, office 365, bing and surface were started under him. His big losses were the smart phone and search engine. If you consider that he inherited the fear of break up from the anti-trust stuff, you'll understand he was fighting with one arm tied behind his back. Nadella basically reorganized stuff around, slimmed the company down and focused big on CLOUD, AI and Blockchain - the new fads.