A lot happened in the US smartphone market from October 2009 to January 2010, but thankfully there are companies like comScore kicking about to help us make sense of just which platforms were the biggest winners and losers during this period. The biggest platform was not surprisingly Google’s Android which saw an uptick of 4.3% to a total of 7.1% thanks in part to the successful launches of handsets like the DROID, DROID ERIS and Hero. RIM’s BlackBerry OS, which faired second best with a gain of 1.7% continued to dominate the total smartphone market at 43%, but one has to wonder if RIM could have done just a little bit more. After all, it did launch the BlackBerry Bold 9700, Curve 8530 and Storm2 during these months. Apple’s iPhone didn’t do as well as many would have guessed, but its 0.3% increase makes quite a bit of sense when you consider the tradition of people holding out on iPhone purchases in the six months leading up the summer release of the devices later iteration. Nonetheless, it does hold a 25.1% stake in the US smartphone market. When it comes to market share, one’s success is another’s misfortune. Not exactly a stranger to losing ground, Microsoft’s Windows Mobile managed to shed 4.0% thanks in part to what can be politely summed up as a general indifference to its current platform (how things will change). After this, we saw Palm with a loss of 2.1%. In Palm’s defence a lot of this can be attributed to people finally getting around to ditching Palm OS, but the fact remains that thing’s aren’t going to well for a company that many felt was on the path to recovery just 15 months ago.