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Microsoft is only offering the Windows security updates that were released on January 3, 2018, to devices that are running antivirus software that is from partners who have confirmed that their software is compatible with the January 2018 Windows operating system security update.

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    Of particular note, this affects you if you have disabled Defender. Not limited to “bad” AV software.

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      So, if I have no antivirus installed at all, updates will be disabled?