MS has had handhels for years... called Laptop's, PDA's, and Pocket PC's... lol
Sort of...
For the record I loved AoE 3 on my MDA.
PS4 Preordered - 06/11/2013 @09:30am
XBox One Preordered - 06/19/2013 @07:57pm
"I don't trust #XboxOne & #Kinect 2.0, it's always connected" as you tweet from your smartphone - irony 0_o