Microsoft's browsers suffered another big setback last month, losing so much user share that they fell beneath the 20% bar.

According to U.S. analytics vendor Net Applications, the user share of Internet Explorer (IE) and Edge — an estimate of the world's personal computer owners who ran those browsers — plummeted by 1.9 percentage points, ending at a combined 19.3%. The downturn was the largest since October 2016.

September's decline was previewed the previous month, when IE+Edge lost nearly a full percentage point after a five-month stretch when the browsers' slump had been relatively small.

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