Sorry Microsoft and Apple, you may have had some fancy smartphone sales this year in your cute little American way, but globally there's no question who's the real leader in this segment: the Symbian OS shipped on 77.3 million units in 2007. That's a 50% growth over 2006 sales, with over 141 different phone models from eight licensees. If the new hotness from Nokia this year at MWC is any indication, those numbers aren't going to go away very soon, but Sony Ericsson's adoption of Windows Mobile for its flagship XPERIA X1 certainly spells a modicum of trouble for Symbian land.