More than any other factor, poor distribution is preventing Microsoft and its Surface tablet from taking on Apple. That’s according to Detwiler Fenton. “Lack of retail exposure at Best Buy and others is severely depressing sales,” the Boston-based brokerage firm said in a new research note. As a result, as AllThingsD point out, Microsoft is expected to sell a measly 500,000 to 600,000 Surface RTs in the December quarter.