I have managed to get Coolbook works on macbook pro mid 2009. I think that this workaround will work on all OS X Lion platform. Here is how I made it work: This method is for advanced users, please be a aware first. My specs: - Macbook pro mid 2009 - OS X Lion 10.7.2 beta 11c57 / 11c62 runs on 64 bit kernel. Kexts detail: - I thinks these kexts will work on both 32 and 64 bit kernel mode and works on all Lion version up to now. 1. Install latest Coolbook 2.22 version. 2. Grab 2 kexts from attachment and installing to your OS X, this is my manual way to install kexts for Lion: ++ Extracting zip files and copy these kexts into Macintosh HD/System/Library/Extensions folder. ++ Set permission and owner rights: Code: sudo chown -R root:wheel /System/Library/Extensions Code: sudo chmod -R 755 /System/Library/Extensions ++ Re-cache extensions: Code: sudo kextcache -system-prelinked-kernel Code: sudo kextcache -system-caches ++ Restart your laptop, done. I can get my laptop run at email@example.com and firstname.lastname@example.org, it's totally cooler than stock Apple Intel CPU kext which fires CPU at 1.12v maxspeed. P.S: Coolbook will not put CPU voltage below 0.9v for my case, stock Apple kext can put under 0.9v with 800mhz speed but it's hotter than Coolbook solution.