I have never been excited about Windows operating system until I saw the features that will be included in Windows 10. This will surely put Microsoft Windows ahead of the compitetion.
Watch Microsoft's VP Joe Belfiore's introduction of Windows 10 tech preview..
Remember, the tech preview is intended for tech savvy who wants to test the operating system even before it will be released to the market. It is expected to be buggy, and with limited functionality. If you are that person, then go ahead and download it from this link Windows 10 Tech Preview.