Summary Mac OS X v10.6 Snow Leopard and OS X Lion are designed to protect your Mac from certain incompatible software that can quit unexpectedly or cause other issues.

When you install the operating system or when you migrate from another Mac, known-incompatible software is moved to a folder named "Incompatible Software".

Mac OS X also prevents known-incompatible software from opening. If you see a message indicating that you can't use the version of the application, contact the software's vendor or visit their website for a later, compatible version.

Software restricted during installation and migration During installation, Mac OS X moves known-incompatible software to a folder named "Incompatible Software" at the root level of the hard drive. If you see this folder on your Mac, see what applications are in it, then check with the application's developer for available updates. To obtain a new version of an Apple application, open Mac App Store or visit the Apple Store website.  

Software restricted from opening After installation, if you try to open ("launch") software known to quit unexpectedly, Mac OS X will prevent the application from opening, and you will receive a dialog notifying you of the incompatibility. If you see such a dialog on your Mac, then check with the software vendor to see if any updates are available. To obtain a new version of an Apple application, open Mac App Store or visit the Apple Store website.

Read more http://support.apple.com/kb/HT3258