"Many people say that Windows Phone 7 is a threat to
iPhone because they are bringing in a super platform with a choice
of multiple designs and multiple carriers with great Enterprise and
gaming support and maintaining the lucrative integration that
iPhone provides. Many also say that Windows Phone 7 is a threat to
Android because it solves the problem of Apple's draconian
policies, gives choice to customers and all this without
fragmenting the OS all over the place.
"However, I beg to differ. Windows Phone 7 is a threat to the
world wide web and web apps. It plans to help the developers and
users by going one up on fragmentation of Android but in the
process will fragment the web app world itself."