Developers that have registered with Windows Store have access to the Dev Center Benefits program. Sign into http://dev.windows.com/benefits to learn more about your benefits.
There are a variety of benefits available to help you plan, build and market your app. A full list of benefits is on the Dev Center Benefits portal.
By default, all members are eligible for a basic set of benefits. As your app grows in success you may be promoted to the next membership tier, which includes additional benefits.
Some benefits also require you to meet additional criteria, such as releasing or updating an app in the last six months. Each benefit’s details page will indicate the specific requirements.