It's not just for touch mice, if you've got an MS mouse, you've got access to Ex-faux-se.
...though it kinda sucks using it on a mouse with less than 4 buttons.
Ah right, I never got it before, my previous mouse was a Microsoft Sidewinder X8, Microsoft said it was only with their touch mouse, a friend of mine has the Arc mouse and he didn't get the Expose.