IDC reported sales and usage numbers for all smart phones today. Windows phones dropped to 3.1% market from 7% market share this time last yea. as sales of iPhones and Androids have skyrocketed. Sorry, don't have a link. It's subscription only but should be found somewhere soon.
Android is just killing all OS with top class smartphones on their OS. Right now Android 2.3 GingerBread is latest version which have far better features compare to Froyo and Google not stop their progress here but they are aiming Android 2.4 version in sumer and they already have 3.0 HoneyComb for tablets! Windows Phone 7 is new OS and still behind to other OS in terms of features and supports! One of the main reason why WP losing their market share is they have less apps compare other OS.
Microsoft seem unable to learn that you can't release substandard operating systems on devices where they don't have a virtual monopoly.