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I don’t understand what all the fuss is about on this topic. I have a new Macbook Pro, running Leopard. I use it for teaching image processing workshops, and never know exactly what version of Photoshop various clients will have installed, so I have Photoshop CS, CS2, CS3 and CS4 all installed. They all run just fine. For what it’s worth, I also have Win XP installed so that I can boot into it instead of the Mac OS, and on that side I also have CS, CS2, CS3 and CS4 installed, as well as Photoshop 7 (which does not run under OS X on my Intel Mac). And they run fine. I did have some problems running the older versions under Vista, which is why I am using XP. Apple has done a very good job of maintaining compatibility with older software as they have migrated from the PowerPC to Intel, and from an older operating system to Unix-based OS X. Only on the newest machines is it not possible to run Classic mode that allows some really old legacy programs to run.
John Russ (DrJohnRuss.com)
John Russ (DrJohnRuss.com)
How to Improve Photoshop Performance
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