The Update Release Candidate for Parallels Destkop for Mac is here, and its loaded with great new features! The big three are: - Support for Mac Pro towers with up to 4GB of RAM - Compatibility with developer builds of OS X "Leopard" - Experimental guest OS support for Windows Vista Beta For a full run-down of new features, functions and improvements, check out the Parallels Update RC main page. Upgrade your copy of Parallels Desktop for Mac, or start using it for the first time, by visiting our download center. NOTES ON INSTALLING THE UPDATE RC: If youâ€™re new to Parallels Desktop for Mac: you can start using improved Parallels Desktop for Mac by downloading and installing the RC on a Â«cleanÂ» machine. If you already have Parallels Desktop for Mac: Updating your build is easy. Just download the Update RC file and install it over your existing version. You will NOT need to reinstall any guest OS or any applications when you update your Parallels Desktop for Mac. Don't forget to update Parallels Tools after installing Update RC!