For the third day, millions of BlackBerry users around the world have been unable to use messaging and browsing services. Users in Europe, the Middle East, Africa, and India lost access to their devices' most essential service. American users, who had initially been sparred from the outage, have also reported service issues. All this bad news for BlackBerry's manufacturer, Canadian firm Research in Motion, comes on top of the blockbuster success of Apple's new iPhone 4S, which was released on Friday. The BBC's Rory Clellan Jones  has the latest on the story.

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