I always feel bad for Jennie when there is a television or radio commercial and at the end it says, "Check out our mobile app on the Apple App Store or Android Market/Google Play!" She has a Windows Phone 7 device. And there are a lot of such commercials.
It is a shame because it is a really nice OS. But Microsoft is working against its own reputation, competing with two other OS's whose companies have generally positive mindshare, being late to the game, and suffering from the chicken-and-the-egg syndrome in regards to its available apps -- all at once.
