Apple has managed get almost 11 percent of computer market share in the US, IDC said in a preliminary estimate on Wednesday. Mac shipments shot up nearly 15 percent year-to-year in the spring to put Apple at third place in the US with 10.7 percent and 1.92 million Macs. Much of that growth came at Acer's expense, as the Taiwan company's overdependence on netbooks and failure to cope with the iPad saw its shipments drop by more than a quarter, sinking it from third place a year ago to fifth place, with 8.5 percent.