Apple sold more PCs worldwide last quarter -- 21 million -- than any rival, retaking the lead it lost the quarter before, U.K.-based Canalys said yesterday. And because Microsoft lacks a tablet operating system, sales of Windows-powered PCs fell to an all-time low as a percentage of total sales. Unlike other research firms, Canalys counts tablets 7-in. or larger as PCs, figuring that they're used for many of the same purposes as a notebook or even a desktop. Using that definition, Apple, which sold 17 million iPads and 4 million Macs during the period that ended June 30 -- shot to the top of the chart. Apple regained the No. 1 position in the second quarter after ceding it in the first to Hewlett-Packard. The Cupertino, Calif. maker of Macs and iPads had last been the world's top-selling PC seller in the fourth quarter of 2011. Canalys pegged Apple's 21 million units as 19% of the sales share, well above both HP and Lenovo, the No. 2 and 3 manufacturers, which each sold approximately 13 million PCs for a 12% share. Rounding out the top 5 were Acer and Dell, with unit sales of 10.6 and 9.6 million, respectively. Read more: http://www.computerworld.com/s/arti...op_spot_as_Windows_share_decays?taxonomyId=15