What does Windows 7 phone need to succeed??

Microsoft recently launched Windows Phone 7 with a New York City event on Oct. 11 and hopes that the smartphone platform will attract customers who would otherwise gravitate toward the Apple iPhone or a Google Android device. As opposed to those platforms, which offer grid-like screens of individual apps, Windows Phone 7 aggregates Web content and applications into six subject-specific “Hubs,” such as “People” and “Games.”

A shiny user interface, however, won’t be the sole determinant of whether Windows Phone 7 succeeds in the marketplace. If Microsoft wants to reverse its steadily declining share of the smartphone market, it will need to rely on some key factors swinging in its favor. So, what would be those key factors which will make Windows 7 phone a success??