Before I upgrade to Mountain Lion, I want to make sure all my existing software is compatible with it, especially: * Audio Plug-Ins (Audio Units) * MIDI Plug-Ins * MIDI Drivers * Printer drivers * Audio interface drivers * MIDI interface drivers * USB->Serial adapter drivers * Input Methods * File Systems * PreferencePanes * Extensions (/Library/Extensions etc.) * 3rd-party Frameworks * etc. I had very few compatibility problems going from Snow Leopard to Lion -- all my existing software worked. I had to update a couple of things but nothing became unusable. How can I find out if my stuff will work on Mountain Lion, short of just upgrading and "finding out the hard way"? I did find a nice list on a website that lists compatibility for a lot of applications, but it does not deal with drivers, plug-ins, file systems, or any of those other things that exist within the sub-folders of /Library/ and /Users/me/Library/. It would be nice if there was an app that you could run which would scan all that stuff and tell you if it's known to be compatible, unknown, or known to be incompatible.