While the personal computer business overall contracted another 8% to 11% in 2015, Apple continued to grow shipments of its Mac line, one of only two manufacturers in the top five to do so throughout the year, according to estimates from researchers IDC and Gartner.

Global PC shipments during 2015 declined by 11%, said IDC, or 8% by Gartner’s measurements. The difference in the two estimates stemmed from the ways each firm tallied shipments: IDC did not include so-called “2-in-1” devices, tablets that offer detachable keyboards, such as Apple’s iPad Pro, Microsoft’s Surface Pro 4 and the Windows-powered alternatives crafted by OEM (original equipment manufacturer) partners; Gartner included those form factors in its count.

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