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Android OS Version 2.2, aka Froyo. Only add an operating system tag if your question is truly about the OS!

This is the 7th version of Android released by Google On 20 May 2010. Android 2.2 is based on Linux Kernel 2.6.32 and included many new features like:

  • General Android OS speed, memory, and performance optimizations
  • Additional application speed improvements courtesy of JIT implementation
  • Integration of Chrome's V8 JavaScript engine into the Browser application
  • Increased Microsoft Exchange support (security policies, auto-discovery, GAL look-up, calendar synchronization, remote wipe)
  • Improved application launcher with shortcuts to Phone and Browser applications
  • USB tethering and Wi-Fi hotspot functionality
  • Added an option to disable data access over mobile network
  • Updated Market application with batch and automatic update features
  • Quick switching between multiple keyboard languages and their dictionaries
  • Voice dialing and contact sharing over Bluetooth
  • Support for numeric and alphanumeric passwords
  • Support for file upload fields in the Browser application
  • Support for installing applications to the expandable memory
  • Adobe Flash 10.1 support
  • Support for extra high DPI screens (320 dpi), such as 4" 720p[21]

via Android version history