Ars Technica posted a review on Windows Phone 7
The smartphone market ain't what it used to be. Four years ago, Symbian ruled the world was totally dominant in every market but three: Japan and China both had strong showings from Linux, and the North American market was split roughly evenly between RIM, Microsoft, and PalmSource. Worldwide, smartphone sales amounted to some 60 to 65 million.Windows Phone 7: The Ars Review
Then Apple came along with the iPhone in 2007 and changed the world.