Microsoft's earnings by segment
Here are the official filing to the SEC of Microsoft’s revenue and earnings by segment. Scroll down to note 9.
They have a profit margin of 86% on Windows (most claim 85% but they don’t know how to round numbers) and 79% on Office.
Damn! Amazing! It must be great to have a monopoly in a market, not to mention three: Desktop OS, office suite, and browser.