No, we don't have a list like that. Laserfiche has come a long way since version 6.1 and the current product resembles that version only barely. It would take ages to compile all the differences. Laserfiche Workflow is probably the biggest addition, but we also have things like Laserfiche Forms. If you have a client asking for it, I think you can say that, at a high level, version 6.1 was about managing documents, whereas version 9.1 is about managing content and automating business processes.