Apple stands to lose its No. 1 rank in mobile PC sales this year as Hewlett-Packard and even Motorola eat into its market share. Apple’s shipment of 10.2 million mobile PCs gave it a 17.2 percent market share in the fourth quarter of 2010. Consumer reactions to Motorola’s Xoom tablet, seen as an iPad rival, could push that manufacturer up in the rankings. HP’s TouchPad tablet also could push HP upward from its DisplaySearch rank of No. 2 in the last quarter.”]