Latest news for the folks that are using Windows smartphones. Starting from today, in order to access Marketplace, your smartphone must be equipped with at least Windows Phone 7.5.
As reported in Windows Phone Blog:
Most phones are already running Windows Phone 7.5, which was released last fall, and so you won’t notice anything different about how the Marketplace works. However, if your phone has an earlier version of our software installed, you’ll soon start seeing an error message when you try to download a new app, or update one you already own. (I say “soon" because it will take a day or two for the changes we made today to take effect.)So better go and upgrade your smartphone OS now in order to access Marketplace.