Microsoft’s Windows 10 beat a retreat last month, losing user share for the first time since its debut more than a year ago.

According to U.S. metrics vendor Net Applications, Windows 10 lost half a percentage point in user share during September, ending the month on 22.5% of all personal computers.

Windows 10 powered 24.8% of all machines running Windows: The difference between the user share of all PCs and only those running Windows originated with the fact that Windows powered 91% of all personal computers, not 100%.

September’s decline was the first since Microsoft officially launched Windows 10 in July 2015, and the only since January 2015, months before when Microsoft offered only a preview to beta testers.

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