Fast Speed, Light Weight
It has snappier performance and faster loading speed than before, thanks to the HTML5 cutting-edge technology.
It works well either on the mobile, tablet or PC, with or without Flash player support.
The major advantage is that the same URL applies for both PC-based and mobile-phone-based web sites and both groups of users can get the layout and content that best fit their devices. It's all automatically!
Specifically, it supports multiple browsers on desktop: IE8, IE9, IE10, Windows 8-style UI IE10, Firefox, Chrome, Safari, and multiple devices like iPhone, iPad, iPod, Android phones as well.
The HTML client also supports video chat, although confines to the desktop edition, not available to the mobile one yet.