My last Windows phone was a Cingular branded model 3125 from HTC (The Q-tek) clamshell type smartphone. Everytime you used any application on it you would have to use the task manager to close the app or they would all reside in the memory slowing everything down to a crawl. Every screen was accessed using either the "next" or "back" key and it seemed that you were always pressing them just to do anything on the phone. It really was a pain in the arse. By contrary the I love my N900 and my E71.