I was focusing on application software, notably Acrobat and Illustrator, which has been growth market for Adobe since typeset sales to printers and publishers started to tail off almost 10 years ago.
Clearly if your collaborating on acrobat project and your on Mac platform and you corporate customer is on PC with newer version, you may be screwed if you can't get full functionality. MSFT did it to APPL on Office for Mac several years ago.