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The reason I still use the Vaio for some audio editing tasks is that Adobe Audition (actually, for me, Cool Edit Pro 2, since I have seen no need to upgrade to the latest iteration, as CE2 works just fine) is not available for the Mac. I'm stuck with an OK piece of freeware, Audacity, that does a lot, but not all, of what Cool Edit does, but kludgier. Of course, I could spend $900 on ProTools for Mac...nah, I couldn't, that would be a moronic waste of money.
As other dual-machine users can attest, there's a lot you can't do with a Mac (or do as easily) because the software isn't there. just as Macs get fewer viruses because it makes no sense to write a virus for a niche machine, Macs get fewer software choices because it makes no sense to write a program for a niche machine (especially if the program has a limited market itself).