Microsoft: Four million Windows 8 upgrades so far

Microsoft CEO Steve Ballmer has confirmed here at the BUILD 2012 developer keynote that since Friday, the official launch of Windows 8, the company has already sold four million Windows 8 software upgrades. That's certainly not a bad start for Windows 8 but at the same time, most people will likely still stick with their current Windows OS and wait to buy a new PC to get Windows 8. On that front, Ballmer says that sales of Windows 8 products are good so far.