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Microsoft has reportedly completed development on the Windows 8.1 update and signed it off as (released to manufacturing) RTM. This indicates that the final version of Windows 8.1 is headed to manufacturers, so that it can be included in devices in time for the upcoming holiday seasons later this year.
The final version of Windows 8.1 is expected to be made available to users through the Windows Store on October 17, and we can expect Microsoft will continue fine tuning the platform before it reaches our computers.