Microsoft has released the Windows 8 Release Preview on 31st May 2012 and it has been almost 2 months now. I have couple of installation of the Release Preview version and it is so far working perfectly fine on couple of my computers.
For those who has not try out Windows 8, I would encourage to try out this pre-release software,Windows 8 Release Preview which is available for download on the official Microsoft Windows 8 Release Preview website. There are two editions available for download, the 32-bit and 64-bit. The Windows 8 works great on your current Windows XP or Windows 7 hardware and most Windows 7 applications works fine on Windows 8.