Seattle - Online retail giant Amazon.com announced on Friday that it received more pre-orders for "Harry Potter and the Deathly Hollows," the final installment in author J.K. Rowling's series, in its first seven hours of availability than it did in the first two days of pre-order sales for the sixth book, "Harry Potter and the Half-Blood Prince." Seattle-based Amazon said it received a total of more than 1.5 million advance orders for the sixth book, which was released in July 2005 and figured as the largest, most successful product release in the company's history.

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