The messages app is fairly complicated since it now exists on two platforms with different functionality on each.

  • iOS Messages is one of the original apps and went from SMS only, to SMS and MMS and now SMS, MMS and iMessage on iOS 5.
  • OS X Messages was available in beta software on OSX Lion but is now only available with OS X Mountain Lion. Messages on Mountain Lion unifies iChat and iMessages on the OS X platform.
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