CS2 is unsupported under anything later than 10.4 and is not Intel native which introduces a new set of problem. I would also advise against buying used software without assurance that it can be regstered to you.
Thanks for the fast reply. Most helpful.
So, to rephrase my query: What is the earliest version of ID that runs on an Intel dual core Mac with OS 10.6?
Thanks for the tip on buying used software. As an author I'm fiercely proactive about ensuring any software I get is absolutely legit. I will get an iron-clad guarantee from anyone from whom I buy an Adobe product that it can be registered to me.
CS3 and later should work fine.
Thanks again for your follow up. I'll certainly keep that in mind.
As for "CS2 is unsupported under anything later than 10.4," FWIW, I find it intriguing that even my mid-Pleistocene ver. of ID 2.0 ran beautifully on my Intel MacMini (purchased in 2006) right up until I installed OS 10.6 this spring. Perhaps the distinction here is technical. Which is to suggest that even though an app may not be "supported," it may nonetheless be "compatible (i.e, runs fine).
Semantics aside, please consider my question answered. I'm obliged to you.