Windows 8 Release Preview is a pre-release version of Windows 8 that demonstrates powerful new ways to use social technologies to connect with the people who are important to you. It’s Windows reimagined. Windows 8 Release Preview is built on the rock-solid foundation of Windows 7 and has the security and reliability features you expect from Windows. Microsoft have now removed the links to the Release Preview of Windows 8 from their website, but you can still download the Enterprise Evaluation version to trial for 90 days, after which you will need to buy Windows 8 or go back to your original operating system.