Windows 10's user share last month jumped by the largest amount in more than two and a half years, a strong signal that customers running older OSes may have gotten serious about meeting the looming retirement deadline of Windows 7.

According to web analytics company Net Applications, Windows 10's share climbed by 1.7 percentage points in January, ending the month at 40.9% of all personal computers and 47.4% of all PCs running Windows. (The second number is always larger than the first because Windows does not power all personal computers; in January, Windows ran 86% of the world's machines. Most of the rest ran macOS, Linux or Chrome OS.)

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