O&O Software is currently offering their O&O Defrag 10 Professional Software for free! Basically, you have to Sign Up Here and then wait for the key to arrive in your email inbox. Very simple and easy. I used O&O Defrag for ages, but stopped doing so after some later updates made it not work as well. However, that is not to say this version is bad as I haven’t used this one. Check out O&O Defrag 10 Professional today!