I only have CS3 thought I use CS5 at work. They pretty much mostly work the same for me except for some more specialist functions. It would be great if CS2 was free - it is very capable. The other option would be offering CS2 for a nominal fee ($5 or $10 maybe?) - it's an old program and as the activation servers are now down, it might get people to pay a little money for something they would otherwise have pirated.