Just wondering, how many folk can use either hand for the mouse.  I started using the mouse with my left hand and stuck with it for many years.  But when I had Carpel surgery I had to switch to my Right hand.  Also I do almost every thing else with my right hand.

  Recently my right are started having tendon pain. So I switched back to my left hand.  It only takes a few moments to get used to using the other hand.  But I do keep all my mouse buttons the same.