Worth a read:
Making it different versus making a differenceBut for those that want the Clif notes version:
"How many apps does it take to screw in a light bulb? That was the question facing Microsoft as rival mobile operating systems backed by Apple and Google added tens of thousands of applications giving users stylus-free access to a wide range of capabilities."
"Key among the new [Microsoft] concepts are hubs, which are live centers of interest that seamlessly branch to each other. For example, the People hub branches off to maps, Xbox Live, and social networks, and a Music and Videos hub integrates with streaming services such as Pandora instead of having to return to the device's main screen and relaunch it. "
"In this case, the targets were Apple, which was chided for the iPhone's app-centric unitasking that requires frequent launching and in and out of different apps, and the many smartphones and feature phones that have aped the iPhone's appearance....while its approach is unique, Microsoft is touting many of the same integration messages that we've been hearing from Palm and Motorola."
"Windows Phone Series 7 is different from its predecessors, it's different from the iPhone, and it's different from desktop Windows, But different doesn't always mean better. Microsoft's burden is to prove that its visual distinction and smooth integration outweigh the advantages of market leaders."