Here's how Windows 10 sales compare to Windows 7 and 8

Business InsiderHere's how Windows 10 sales compare to Windows 7 and 8Business InsiderWithin the first week of availability alone 14 million users installed Windows 10. So for Microsoft to add another 61 million users over the next three—a rate of more than 20 million a week—is a huge achievement. But how does it compare to Windows 7 ...