Microsoft's quest for smartphone market share is hitting a few roadblocks, it seems. Kantar estimates that Windows Phone is still gaining ground in Europe, where it's up year-over-year to 8.1 percent of sales in the first quarter of 2014. However, it's taking a bruising in other areas. In the US, Windows swung from increases this fall to a slight dip in the winter; while it's still doing relatively well at 5.3 percent of US share, it's not posing much of a threat to Android or iOS right now. The platform also took a drubbing in China, where its share was nearly cut in half to exactly one percent thanks to the rise of budget Android handsets.