The Mac owns the U.S. Windows owns the world. Nary the two shall meet?

This blog incorrectly stated Apple's global market share.

This blog initially misstated Apple's global market share. It was 3.3 percent in the second quarter, according to IDC, up from 2.9 percent a year ago. Read the updated story here .

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The problem with Amazon Dash buttons

Limits on choice mean new shopping gadget won't click for everyone. Bridget Carey explains how the buttons work, and the rule changes for sharing your Prime perks with others.

by Bridget Carey