Is OS X 10.8 compatible with Adobe Creative Suite 5.5?

The original CS apps will not launch under Lion or Mountain Lion as it is all PowerPC code. The bare minimum of the CS line with Intel code is CS3.

CS 5.5 and CS6 are officially supported in Mountain Lion by Adobe. Older versions back to CS3 do work, but some functions may not work well.

To: OP

If you find this screenshot interesting, Kurt will explain it to you...

[click on image to enlarge]

My statement meant that CS or CS2 cannot run directly in Mountain Lion because they are PPC code. What Michael is showing is Snow Leopard Server running in the Parallels VM software. You can then run your otherwise unusable PPC software in the VM. Here, he has the original PS CS running, even though Lion is the host OS.

You were asking about CS5.5 though, so this is not necessary. It will run under ML as is. Michael's note is certainly still useful if you have other PPC software to run that you either can't update, or is too expensive to update.

Check to make sure your applications are compatible other than CS. Application Compatibility