Brad Wasson wrote an article about the feature customers of Windows Phone 7 based on his own thoughts. He separated the feature customers in three categories:
1. Existing Customers That Switch From an Older Product to the New One
2. Customers Using Competing Products That Are Convinced to Switch
3. Customers That Don't Currently Have a Product of This Type Which Enter the Marketplace and Purchase your Product
He also describes why the customers from every category will choose Windows Phone 7 instead of some of its rivals.
You can read the full story here.