Windows 10 powers 164M PCs at end of '15

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