Photo Stream is a feature available to iCloud users which allows them to automatically sync images taken across all iOS devices. So in order to use 'My Photo Stream feature, you need to have an iCloud account, a compatible device and an up-to-date software.
Whichever iOS device you are using, it must have iOS 5.1 or later. If you are using Mac, then it should have OS X Lion v10.7.5 or later and iPhoto 9.2.2 or Aperture 3.2.3 or later version. You can use My photo stream on Apple TV (2nd generation) which has Apple TV software Update 5.0 or later. If you want to use Photo stream on a PC then it should have Windows 7 or later and either iCloud for Windows 4.0 or iCloud Control Panel 3.1 or later.
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