As Gartner did a few hours ago, IDC also published on Wednesday its updated research on the world PC market and the numbers are not very different.
Apple grew 18% in the United States in the fourth quarter of 2011, maintaining the third position ahead of Toshiba (see the previous quarter's survey here). It totaled more than 2 million Macs shipped in the period.
As you can see, once again Apple was the only one among the top five manufacturers to be positive. Overall, the industry average was -6.71% over the same period in 2010.
Unlike Gartner, IDC also published a general US table for 2011:
Apple managed to close the year in third place, with a growth of 16.41%.
In the worldwide IDC table, the five largest manufacturers today are: HP (16.31%), Lenovo (14.04%), Dell (12.91%), Acer (10.56%) and ASUS (6.73 %). In the accounting for the whole year of 2011, the positions are the same only the market shares that vary slightly: HP (17.69%), Lenovo (12.49%), Dell (12.57%), Acer ( 10.55%) and ASUS (5.89%).
According to IDC, a total of 352.4 million computers were shipped last year1.6% more than in 2010.