Digidesign is pleased to announce the availability of Pro Tools® 7.4.2 software, which provides Mac OS X 10.5.3* (Leopard) compatibility to Pro Tools|HD, Pro Tools LE, and Pro Tools M-Powered users. We'd like to thank our entire community of Mac users for their patience as we worked to bring a fully tested and reliable version of Pro Tools to Apple's latest platform.

If you haven't yet upgraded to Pro Tools 7.4 software, you can purchase an upgrade to the latest version from EAR
(Pro Tools HD only). 

Important Plug-in Compatibility Information
Some currently shipping plug-ins and virtual instruments are not yet compatible with Pro Tools 7.4.2 software running on Mac OS X 10.5.3, and some plug-ins require an update if one is available. Before updating to Pro Tools 7.4.2, please review the Pro Tools Plug-in Compatibility with Leopard page, which is updated regularly with the latest info.