Windows 10 will have grabbed between 19% and 21% of the personal computer operating system market by its one-year anniversary, putting Microsoft a third of the way toward its goal of 1 billion devices, according to an analysis of the upgrade’s uptake rate so far.

Data published last week by analytics vendor Net Applications pegged Windows 10’s user share — an estimate of the percentage of the world’s computers that run individual operating systems — at 14.2% for March, an increase of 1.3 percentage points over the month prior.

Eight months after its launch, Windows 10 powered about 15.6% of just those PCs running Windows; the percentage among Windows systems was higher than for all machines because Windows ran on 90.5% of the world’s PCs, not 100%.

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