Research firm IDC today announced its preliminary estimates of worldwide tablet shipments for the second 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 32.4% share of the market for quarter, compared to 39.6% in the previous quarter and a 60.3% share in the year-ago quarter. While other top tablet manufacturers saw their shipments rise by 100-300% over the second quarter of 2012, the lack of a new iPad launch from Apple in the March-April timeframe resulted in a 14% drop in Apple's numbers. Still, other top vendors saw their shipments drop sequentially, with IDC attributing those drops to a lack of a general boost in tablet interest that accompanies iPad launches.