If you been exploring the web since the 90's at one point or another we have all used IE. With Firefox and Chrome dominating web browsers the past four years I'm surprised MS hasn't done this sooner. I'm looking forward to WIN10 this summer so for MS sake Spartan better be, well, better. I'll give it a try to just to see how it is.
Also I wonder what this new browser means for XB1, because Win10 will be implemented into the XB1 at some point, probably not at release but soon after.