Nearly three months after its release official sales numbers for Microsoft’s (NASDAQ:MSFT) Surface RT tablet are still impossible to find. Despite expressing its happiness with the tablet’s performance Microsoft has yet to publicly proclaim the RT a success keeping its sales records a closely guarded secret. That hasn’t stopped analysts from offering hypotheses on how the Surface is selling though and as the release of the Pro looms many have become curious on how its predecessor managed.   Last month analysts from Detwiler Fenton projected that Microsoft would fail in selling over 1 million units before the quarter ended ...