Some say at its heart, Microsoft CEO Steve Ballmer's plan is meant to unify a company that has been more of a group of tech fiefdoms.

The tech giant plans to revamp its structure and management, as the tech world changes from PCs to mobile devices and cloud computing.

Steven Sinofsky, who was president of Microsoft's flagship product Windows, is leaving the company. His departure comes as a surprise, less than one month after the release of Windows 8.

The stakes couldn't be higher for Microsoft as the company launches Windows 8 and the Surface tablet. Microsoft CEO Steve Ballmer says the release is an epic moment for the company on par with Windows 95.