Apple last week said it sold a record number of Macs for a September quarter.

"The Mac...had its best year ever, with the highest annual Mac revenue in Apple's history," said CEO Tim Cook in prepared remarks during a Nov. 2 call with Wall Street analysts. Apple recorded revenue of $25.8 billion from Mac sales in its fiscal 2017, which ended Sept. 30.

Mac unit sales of nearly 5.4 million bested both industry and financial analysts' expectations. Before Apple released its data, research firm IDC had pegged Apple's number at 4.9 million, while rival Gartner offered an even lower estimate: 4.6 million. And according to Philip Elmer-DeWitt, who regularly polls Wall Street for quarterly forecasts, every analyst from a group of more than two dozen undershot Mac sales, some by over half a million machines.

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