All the programs I used in XP and Vista tranferred to W7 without any problem. Backward compatibility is Windows main strengths and the main reason why corporations stick to it. Can you imagine them using Macs where support was dropped after just a few years, where upgrading to new Os meant upgrading the software such as CS4 which means the total cost of ownership is even higher than Windows.
lol
You are forgetting that they are not being "forced" to upgrade. Leopard was working fine in their business model this morning, why would it not be working correctly this afternoon or even late next week?
If they are using CS3 over CS4, they have a reason, whether it is financial or feature related, that is their decision -- this has nothing to do with SL and is Adobe's issue.
What made me chuckle was "Backward compatibility is Windows main strengths ...".
What!? EVERY SINGLE RELEASE of windows has come with a more-than-lengthy list of incompatible software and hardware.
Where have you been for the past 15 years?