Gartner, IDC were both wildly wrong in guessing Apple's Q4 Mac shipments

Two research groups that estimate global PC shipments not only served up incorrect data as fact, but also used the bogus figures to reach entirely false conclusions about Apple's Macs in the global PC market. This isn't the first time they've been so wrong but outlines the lack of accuracy from third-party "sales estimates" as Apple prepares to stop reporting its official sales numbers altogether.