But the difference is that Apple is still pretty much a hardware company. They make their money by people buying their hardware, not using their software. They don't care if you buy a Mac then install Windows on it, or buy an iPod and install a different OS, because it doesn't really hurt their business. Also, the whole iTunes on Windows/MS Office on OS X argument isn't really the point--that is looking at the possibility of Microsoft using Blu-ray on the 360 from Sony's perspective. In that case, it's good for business because you show users of the competitor's product that your product is good, too, perhaps getting them to switch to your product to use more of your other good products. The difference is that for iTunes, Apple doesn't need Microsoft's permission, they just have to make the program and make it available. Then maybe some people on Windows will use iTunes and say "Hey, I like the way Apple does stuff" then possibly switch to a Mac the next time they buy a computer. (And yes, that is unlikely, but iTunes is also Apple's main money-making program, and so having it on Windows is making them money.)