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For the balance of this calendar year, there will be no preview, non-security “C” releases for Windows 10 during the month of December. The "C" releases normally target the third week of the month. Note: There will be a December "B" security update release, as usual. For more information on the different types of monthly quality updates, see our Windows 10 update servicing cadence primer.
Source: https://docs.microsoft.com/en-us/win...ge-center#1523
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