With each and every major operating system upgrade, there are a handful of programs that just won’t work. Snow Leopard is no exception, and the list includes some anti-virus software, old versions of Parallels (2.5 and earlier), a number questionably useful titles, and even some Apple software (AirPort Admin Utility for Graphite and Snow).
If these applications are present on your computer when you install Snow Leopard, there will be a folder called Incompatible Software at the root of your hard drive once the installation is finished. You can check with the software manufacturer for any updates in the coming weeks, but know that there is no workaround for incompatible software available from Small Dog nor from Apple—you must go directly to the manufacturer for any update.
Also on the list are a few applications that are not technically incompatible but will not be allowed to launch, registering a message that the application unexpectedly quit. Apple feels these are safe applications if they are updated for Snow Leopard. This list includes Parallels Desktop 3.0, the hugely popular virtualization tool from Parallels.
Also on the list are a few applications that are not incompatible but will not be allowed to launch, registering a message that the Application unexpectedly quit. Apple feels that these are safe applications if they are to be updated. The list of Applications that need to be updated includes Parallels Desktop 3.0.
The document can be found here: http://support.apple.com/kb/HT3258