If Windows 7 were an actor, it would be a past-prime stage star who overstayed his curtain call and refused to acknowledge his understudy who, just the night before, had wowed the critics and charmed the audience.

Last month, though, Windows 7 ceded a tiny pool of the limelight to that understudy, Windows 10, giving the crowd hope that the aging actor would finally figure out he should exit, stage left, before the theater's manager got the hook and dragged him off the boards.

According to metrics vendor Net Applications, Windows 7's user share in September was 48.4%, a decline of 1.2 percentage points. More importantly, the operating system ran 52.1% of all Windows machines during the same stretch, a month-over-month drop of 1.3 points. (The second percentage is larger because Windows was detected on 90.6% of the world's PCs, not 100%; the remainder ran macOS or some kind of Linux.) This was the largest decline of Windows 7's user share — an estimate of the percentage of the world's personal computers powered by the OS — since July 2016.

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