Research firm IDC today announced its preliminary estimates of worldwide tablet shipments for the third quarter of 2013, finding that Apple's share of the market has fallen to under a third. According to IDC's numbers, Apple held a 29.6% share of the market for quarter, compared to 32.4% in the previous quarter and a 40.2% share in the year-ago quarter. Though Apple's unit shipments grew slightly from last year to this year -- from 14 million to 14.1 million -- because so many more Android tablets were sold, particularly by Samsung and Lenovo, Apple's total tablet market share dropped by more than 10%. Notably, the quarter preceded the recent iPad refresh and should logically be Apple's weakest quarter of the year. Shipments in milli
