Philip Elmer-DeWitt in CNN Money on the contrast between IDC’s numbers and Gartner’s numbers on the PC industry.
While they agree that it represented either the worst quarterly decline on record (IDC) or the worst in a generation (Gartner) — thanks in large part to the disruption caused by the iPad and its imitators — they can’t seem to get their stories straight on the sales of Apple’s (AAPL) computers.
According to Gartner, Mac sales in the U.S. grew 7.4%
According to IDC, they fell 7.5%
Only Apple knows for sure.