I just saw this repost at WPcentral
But here is the kicker .
The Asus 100 reportedly sold 500k units over the holidays season alone , and with its strong demand a 1M mark should not be far (if not already reached , asus expects 2M in 2014) .
But those 500k alone from 1 quarter would put the Surface RT at 3.5M , and the most likely close to 1M figure would put the Surface RT on track to 7M.
Yes, adduplex is not the most accurate method to measure marketshare, but a 4-5M of Surface RT should be more than likely