The third paragraph has been changed and now reads:

IDC estimated that Apple sold 1.81 million Macs in the U.S. during the quarter that ended June 30, down 1.1% from the 1.83 million machines sold in the same quarter of 2011.

The ninth paragraph has been changed and now reads:

Case in point: Gartner has a different take on Apple's U.S. Mac sales. While it also put the Cupertino, Calif., company in the No. 3 slot on Thursday, behind both Hewlett-Packard and , it set domestic sales at 1.91 million Macs for a 4.3% increase over the 1.83 million sold the year before