According to network research company ComScore, the iPhone has overtaken Windows Mobile in U.S. market share for the first time in since its introduction three years ago. Now, we’re not sure whether this is a nod to the iPhone — overtaking a plethora of Windows Mobile handsets on almost every network — or a reminder of the current, and sad, state of Windows Mobile. We can also see, thanks to ComScore, that RIM is the king of the U.S. smartphone market followed by Apple, Palm, Symbian and Android. We’re sure Redmond isn’t all that happy about this; hopefully Microsoft steps on the accelerator and gets Windows Mobile 7 out the door.