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Windows 10 begins to eat into Windows 7's usage share

Gregg Keizer | Sept. 22, 2015
Quick shift from Windows 8.1 upgraders to those updating from Windows 7 is good news for Microsoft.

There are still plenty of Windows 8.1 users who have not pulled the upgrade trigger -- 14.7% of all operating systems in usage share -- but the quick change to Windows 7's dominance in losses has to be good news for Microsoft.

That's not to say that Microsoft has an easy chore ahead. Interestingly, the one-month period where Windows 8.1's losses dominated was also the stretch during which Windows 10 grew its usage share most rapidly. Since then, growth has slowed, perhaps because the early-adopter pool -- again, primarily composed of Windows 8.1 users -- has been depleted.

In the last seven days, the average week-over-week gain by Windows 10 has shrunk to less than one-fifth of a percentage point, meaning at that rate it will take the OS five weeks to increase by one point in usage share. The week before, the average gain was twice as large.

Windows 10's usage share gains, week over week
Windows 10's week-over-week increases in usage share roared out the gate, but have sharply slowed since around the one-month mark. In the last week, weekly growth has dropped below three-tenths of a percentage point, with a new low of under two-tenths recorded yesterday. Click on image to enlarge. Data: StatCounter


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