Asked to comment about the way Windows 7 was portrayed in the morning keynote, Erwin Visser, senior director of the Windows Commercial Business Group, said at a press conference later in the day that Microsoft in no way wants enterprise customers to interrupt migrations to Windows 7 from Windows XP.

"In our conversations with enterprises, we don't want to discourage their deployments of Windows 7," he said.

Microsoft will end support for Windows XP in 2014, so migrating to Windows 7 now is the right thing to do, he said, adding that Windows 8 will co-exist side-by-side with Windows 7 in an organization.

Windows 8 has a new user interface called Metro, which is designed for touch-screen devices, like tablets, but which can also be used with keyboards and mice. The OS will also have a traditional Windows 7-like interface. The Metro interface, whose design and user experience are markedly different from the traditional Windows interface, has been the source of much criticism among beta testers and industry observers, who say it's inconvenient to use with a mouse, and find its overall navigation functionality confusing.

Windows 8 computers based on x86 chips from Intel and AMD will run Windows 7 applications, and will co-exist with Windows 7 machines on enterprise environments, Visser said.