writes "After selling 4 million copies in just three days, Microsoft announced today that it sold 40 million copies of Windows in the first month of general availability. Also, the upgrade sales of Windows 8 are higher than with Windows 7 in the month since launch. Microsoft says there are already some developers who have made more than $25,000 on their Windows 8 apps. That number is significant because Microsoft gives developers an 80 percent cut on all app sales over that figure, as compared to the industry-standard 70 percent on competing app stores. Other notable milestones include reaching 25 million users of the new Outlook.com and beating the entire multi-hundred million strong Android devices' web usage in just 10 days after launch. What does this mean for the much vaunted post-PC era? Combined with the much awaited Surface Pro coming out in January, will 2013 be the year of Windows 8 desktop and tablet?"