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Nielsen released an analysis of smartphone market share by operating system and manufacturer Thursday. The data aren't too surprising. Android now runs on a bit more than half of all smartphones in the U.S. Apple's iOS is at 34% in the U.S.

But we did notice one interesting trend.

Windows Mobile, Microsoft's old smartphone operating system, has more marketshare than the current Windows Phone 7 platform.

That's pretty embarrassing, considering Windows Phone 7 launched about a year and a half ago and is about to be replaced by Windows Phone 8. Microsoft no longer actively supports Windows Mobile.

Even more interesting: Nokia, Microsoft's primary Windows Phone partner, has fewer Windows Phone 7 devices in the U.S. than Samsung or HTC.

Click here to see the features coming to Windows Phone 8 this fall >

Here's the chart:

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