Windows Phone 7 arrived on the smartphone scene bringing a very refreshing and smooth UI. Departing from the iOS and Android style of icons and tabs and tapping and clicking, it created the beloved Metro UI. No later than six months (and change) the Metro UI got the award for the Interactive Product Experiences in the '2011 International Design Excellence Awards'. The live tiles and the panorama screens ,which involve swiping, make the interface a joy to use.
Here's what Co.Design had to say:
The Windows Phone 7 was built around the idea that the end user is king. The design team began by defining and understanding the people who would use this phone. It was convinced that there could be a better user experience for a phone, one that revolves more around who the users are rather than what they do. The Windows Phone 7 lets users quickly get in, get out and back to their lives.
How true. With the Mango Update coming in fall and the marketplace booming ahead the future looks bright for the Microsoft's newest baby.
[Source]