The Mac is now solidly in third place in US market share, Gartner's summer estimates showed. At a predicted 2.3 million Macs, Apple will have shot from 10.8 percent a year ago to 12.9 percent. Once-growing Toshiba has now started shrinking and fell slightly to 8.4 percent for fourth place, while Acer's vulnerability to the iPad left it falling by a quarter to fifth place at 7.8 percent.
