Apple, like all computer companies, gets much of its sales from repeat purchasers. Whether individuals or businesses, users renew their computers every few years to replace aging models and keep up with current innovations. As a professional, I have specific needs: I need one Mac that can do pretty much everything, and I need a second Mac for testing, and to be able to run an unmodified version of Mac OS X at times. (But those needs are limited; I don't use any professional software that would tax any current Mac.) My current setup is a Mac Pro (purchased in September 2006) and a MacBook Air (purchased early 2008). In most cases in the past, this has been about the time that I would replace my main computer (the Mac Pro). But for the first time in the dozen years that I have been a freelancer, my current computer is fast...
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