Only in terms of UI. On the other terms, its way behind. No multitasking, no customizable UI, localization is incomplete, features missing... it's much like iPhoney first was. Restricted, closed but pretty. However, Microsoft doesn't have reputation and brand as strong as Apple did. Yet, markets are different now, so IF there is going to be deep collaboration on Nokia and WP, it needs to develop rapidly to catch Symbian in terms of functionality and reliability.