The latest comScore report on mobile market share doesn’t paint a very good picture for Microsoft. The software company, which is touting its new Windows Phone 7 operating system, actually saw its share of the smartphone market decline by one percent during the 3-month period ended in July, reports comScore.

The decline comes even as more Americans buy smartphones, with comScore estimating that 82.2 million people in the U.S. now own the powerful mobile devices. That was up 10 percent from the previous three month period.

Microsoft held just 5.7 percent of the market. That compares to Google Android — up 5.4 percent to 41.8 percent. Apple’s iOS was up slightly to 27 percent of the market. Here’s a closer look at the numbers:

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