Microsoft took just four days to reach four million sales of Windows 8 machines, and it looks like the 30-day mark has blessed them with some great numbers. We're looking at 40 million Windows 8 licenses being sold in a month - not bad at all.

In terms of upgrades, Windows 8 is beating Windows 7, but considering Windows 7 passed the 600 million copies milestone in June, Windows 8 has a huge, huge job in front of it. Microsoft are having a good run right now, also announcing 750,000 Xbox 360 consoles sold over the Black Friday weekend.

Lacking from these numbers - Surface sales. If Microsoft were doing well, we'd be hearing all about it - so I have a feeling Surface isn't doing too well, but I'm sure that surprises no one.