LifeHacker asks, with the advent of WebApps, is the OS battle a moot point? I personally don't think so. No matter what browser you use, or can use, you still have to have a machine, and that machine still has to be able to A) Boot up, and B) Access local files
I used to be thye guy on the left, but I'm now the guy in the middle, who is, since the release of OS X, more a composite of the guy on the right.
The biggest difference between Windows on the one hand and Mac/Linux on the other is that Windows seems to be always set up to make it easier for the computer to do what it wants you to do. Macs seem to be set up to make it easier for you to get the computer to do what you want it to do.
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