Apple should sell about 14 million iPads during the holiday quarter, according to a new estimate by Canaccord Genuity analyst T. Michael Walkley. The number would represent a significant rise from the previous quarter, when Apple sold 11.12 million units. About 58.8 million iPads are forecast for 2012, which could represent 57 percent of the global tablet market if the latter reaches a predicted 102.3 million units.