The timing of the Windows 10 launch -- coupled with the rollout of the Surface Pro 4 -- has also been perfect for attracting other vendors, he added. "We're expecting a lot of adoption of Windows 10," Bouchard said.
Still, "Android is not out of the race," Bouchard said. The Pixel C from Google, starting at $499, runs Android 6.0. and features an optional Pixel C keyboard for an added $149.
Bouchard and IDC analyst colleague Ryan Reith are curious to see how and when Google will align Android with Chrome, which could result in more detachable products from Google. Also, touch could come someday to the OS X, allowing Apple to expand its offering of detachables.
Until Apple and Google take more such steps, Windows will remain the logical choice for most detachables, Reith said.
IDC predicted Tuesday that Android will have about 18% of the total detachables market in 2016 as well as in 2020, while Windows will grab the majority of the market -- 53% -- this year. That figure will jump to nearly 75% in 2020.
Apple's iOS is expected to take 28% of the detachable market in 2016, then decline to just 7.3% in 2020.
IDC said detachables made up 8% of the overall market in 2015 and will comprise 30% in 2020.
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