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 OS 4.0

( iPhone 4)

Android 2.2. Froyo

(HTC Desire)

Windows Mobile 7

(HTC HD2)

Kernel
OS X Mobile
Linux Kernal
Windows CE 6
Multitouch
Yes
Yes
Yes
Multitasking  
Yes + Push Notification Service
 
Yes
 
Push Notification Service Only (initially)
Tethering  
Bluetooth and USB only. WiFi tethering is possible if the phone is jailbroken.
 
USB + WiFi
 
 
Finger friendly  
Yes
 
Yes
 
Yes
Copy and Paste  
Yes
 
Yes
 
No (Initially)
Keyboard  
Onscreen virtual keyboard only
 
Supports both: Onscreen virtual keyboard + Physical keyboard
 
Supports both: Onscreen virtual keyboard + Physical keyboard
Music Store  
Yes, iTunes
 
Third Party Stores Only.Android Market
 
Yes, Zune.
Music Streaming  
Possible via Third Party only
 
Yes
 
 
Maps wth Free Turn by Turn Navigation  
No
 
Yes via Google Maps
 
Yes via Bing Maps
Games  
Tons of high quality games available on the App Store
 
Games are nowhere as good as the ones on the iPhone platform
 
Xbox LIVE
Social Network for Gamers  
Yes
 
No
 
Yes
Folders  
Yes
 
Yes
 
-
Books  
Yes (iBooks)
 
No
 
No
Over-the-Air Apps Download via Web Browser
No
Yes
No
WiFi Sync with PC/Mac
No, but possible.
No
Since Zune can sync wireless with PC's WP7 might too.
Office Productivity Suite
Yes, in the form of third party apps like Quickoffice
Yes, Google Docs
Yes, Microsoft Office 2010 Mobile.
Default Browser
Mobile Safari
Chrome
Internet Explorer
Flash
No
Yes
No (Initially)
Silverlight(Mobile)
No
No
Yes (most probably)
Default Search
Spotlight Search in OS
Google
Bing
Threaded Email
Yes via Mail App
Yes via Gmail App
Yes via Outlook Mobile
Home Screen
Yes, but no official customization support.
Yes
Yes (Start Screen with customizable Tiles)
OS Updates  
Yes
 
Yes
 
Yes
OTA Updates  
No
 
Yes
 
Yes