Microsoft CEO Steve Ballmer has announced that the Windows 8 operating system has seen 4 million upgrades in 4 days after launching last week. Mr. Ballmer made the announcement at the Build developer conference. Microsoft has delivered Windows 8 to “tens of millions of OEMs” as well.
Earlier this month we wrote about how Microsoft did 1.24 billion hours of Windows 8 testing and it is available on 1,000 certified devices. Around 670 million Windows 7 operating system licenses have been sold as well.