Windows 8 and Windows 8.1 now power more personal computers than the still-strong, senior-citizen Windows XP, according to the latest statistics from analytics vendor Net Applications.

The growth of Windows 8 and 8.1, and the not-quite-corresponding decline of XP, should make it easier for Microsoft to make its public goal of putting Windows 10 on a billion devices by the end of July 2018.

For the first time in Net Applications’ tracking, the combined user share of Windows 8 and 8.1 was larger than that of XP: In May, the Windows 8 duo accounted for 18% of all Windows personal computers and 2-in-1s, while XP powered 16%.

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