Windows Mobile 6.5

Windows Mobile 6.5.3

Windows Phone 7 Series

Windows CE kernel 5.2 5.2 6.0
Minimum resolution None None WVGA
Skinnable Theme Yes Yes No
Finger-friendly No Some  what Yes
Multitouch No Basic Yes
Capacitive touchscreen No Yes Yes
Stylus Required Optional None
Touchscreen keyboard Unfriendly Finger-friendly Finger-friendly
Required buttons Start Start Start, Back, Search
Style of application Normal Normal Task hubs
Pane switching Tabs Swipe "Pivot"
Browser IE Mobile 6 IE Mobile 6 New, still IE-based
Zune integration No No Yes
Xbox integration No No Yes
Social networking Apps / Skins Apps / Skins Built-in

As you can see, Windows Phone Series 7 improves and adds a lot of things that the two previous Windows Mobile operating systems did not provide. Things such as Zune and Xbox integration, a new browser and fully capable multi-touch functionality. It also removes things such as a skinnable theme. However, if you were to look at the user interface of WIndows Phone 7 Series, you can tell why Microsoft did not include that as a feature. As we get closer to the release of Windows Phone 7 Series, we will learn more details about it. Meanwhile, Microsoft has released a long video going over the features of Windows Phone Series 7. It does seem like Windows Phone Series 7 needs work, like fixing issues, but it seems promising: