Windows 10 made up for lost ground last month, adding the most user share since the OS's first full month of availability four years ago.

The large March increase stood in stark contrast to February's odd couple: a decline in Windows 10 share and a corresponding boost to the aged Windows 7.

According to California web analytics company Net Applications, Windows 10's share leaped by 3.3 percentage points in March, closing the month at 43.6% of all personal computers and 49.9% of all PCs running Windows. (The second number is always larger than the first because Windows does not power all personal computers; in March, Windows ran 87.5% of the world's machines. All but a tiny fraction of the rest ran macOS, Linux or Chrome OS.)

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