Read original post by Bernardo Zamora at Windows Phone Developer Blog
When we create apps, we start by defining the goals of the project. If one of the primary goals is revenue, then more work is required to optimize the app so that it can reach the largest number of users and generate more downloads, use, and sales.
Today, I want to share info about the Windows Phone installed base to help you make the best possible decisions about markets, language support, localization, and OS support.