Windows 10 adoption is already significantly behind the uptake pace set by its predecessor, 2013’s Windows 8.1, during its first three months, according to an analysis of OS user share.

Those at fault? Windows 8 and 8.1 users.

They have not migrated to Windows 10 at the speed anticipated by Computerworld, which based its forecast on the rate with which Windows 8 users deserted their problem-plagued OS for its partial reboot, Windows 8.1.

Three months after its October 2013 launch, Windows 8.1 accounted for 34.3% of all Windows 8 and Windows 8.1 devices tracked by analytics company Net Applications, whose results are expressed as user share, a proxy for the portion of the world’s PCs running a specific OS. Computerworld used the adoption rate of Windows 8.1 to forecast Windows 10’s uptake because Microsoft’s only free upgrade prior to Windows 10 was Windows 8.1.

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