IMO it's because of MS' refusal (or inability?) to release products rapidly (unlike Google and others). When MS chooses to enter a market, they like to pour res

IMO it's because of MS' refusal (or inability?) to release products rapidly (unlike Google and others). When MS chooses to enter a market, they like to pour resources into it to DOMINATE within 1-3 years. If they aren't a top 2 or 3 player within those years, they pull out (e.g. silverlight, kin, etc). It's a valid strategy when done well, but it has been hurting their image as a tech leader since they've had many highly public failures.