Informationweek posted a news story that the Windows Phones market share is 38% down since the launch of Windows Phone 7

Microsoft's share of the smartphone market is plummeting at an alarming rate--so much so that the company's last ditch effort to make an impact in mobility, Windows Phone 7, may be irrelevant by the time it manages to ship the much-anticipated Mango update and realize its partnership with Nokia later this year.

Data released Thursday by comScore shows that Microsoft's average share of the U.S. smartphone OS market over the three months ended in June came in at just 5.8%, down from 7.5% from the three months ended in March, and down from 8% for the three months ended in January.

  Windows Phones Down 38% Since 7 Launch