After five months, Microsoft’s Windows 10 powers about 164 million PCs, data published Friday showed.

Windows 10‘s user share — an estimate of the portion of all personal computers worldwide that ran the OS — grew one percentage point in December to 10%, according to metrics vendor Net Applications.

The new operating system’s user share increase last month was slightly less than the month before, continuing a trend of slowing growth. December’s month-over-month increase was below November’s 1.1 percentage points, as well as under both October’s 1.3 points and September’s 1.4 points, not to mention the explosive 4.8-point boost in August.

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