By far it is the best windows I have experienced.IT is user friendly and better than the WINDOWS 7, WINDOWS 7 ULTIMATE, WINDOWS 8, and other ones. It was the latest windows but now WINDOWS 10 is the present latest.WINDOWS 10 is also good but WINDOWS 8.1 is better and efficient to use.it is very easy to install and the start window is more informative and include new features. But however one to install apps from the store or to browse internet from start one needs microsoft account.Good functioning and better services and support.All round use would be better in this OS.