Minimum operating system requirements
You may also use iCloud with the following operating system versions:
iPhone, iPad, iPod touch
- iOS 5*
- OS X Lion v10.7.5 or later*
- Microsoft Windows Vista (Service Pack 2)
* Note: Although you can use iOS 5 and OS X Lion as noted above, you will not be able to take advantage of some iCloud features, such as Shared Photo Streams, iCloud Tabs, Find My iPhone Lost Mode, Documents in the Cloud for iWork, and Find My Friends location-based alerts.