The industry statisticians are prepping their year-end totals. But the introduction of Apple’s iPad brings some ambiguity into the previously finely-drawn categories.

Where do they put the iPad: Mobile PC or mobile computing device? The analyst company DisplaySearch puts the iPad in the PC category with its Monday release of the Quarterly Mobile PC Shipment and Forecast Report. With this calculation, Apple now has a Number 3 position worldwide in the category and ranks Number 1 in North America.

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