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“It’s an area of enormous opportunity. … The sky’s the limit in there,” Cook said.

On Monday, Apple said it had sold more than 4 million units of the new iPhone 4S in the first three days. That’s more than twice the number it sold in the three days after the launch of the earlier model last year.

“In our wildest dreams we couldn’t have gotten off to a start as great as we have on the 4S,” Cook said.

Holiday sales of Macs are threatened by massive flooding in Thailand, which has knocked out several factories that make hard disk drives.

“I’m virtually certain there will be an overall industry shortage of disk drives as a result of the disaster. How it affects Apple I’m not sure,” Cook said.