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Update attack-surface-reduction.md

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Denise Vangel-MSFT 2020-12-08 19:37:01 -08:00
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windows/security/threat-protection/microsoft-defender-atp/attack-surface-reduction.md
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@ -59,7 +59,11 @@ Use [audit mode](audit-windows-defender.md) to evaluate how attack surface reduc
Warn mode helps your organization have attack surface reduction rules in place without preventing users from accessing the content they need to perform their tasks. Warn mode helps your organization have attack surface reduction rules in place without preventing users from accessing the content they need to perform their tasks.
> [!IMPORTANT] > [!IMPORTANT]
> Warn mode is supported on devices running [Windows 10, version 1809](https://docs.microsoft.com/windows/whats-new/whats-new-windows-10-version-1809) or later and [Windows Server, version 1809](https://docs.microsoft.com/windows-server/get-started/whats-new-in-windows-server-1809) or later. > Warn mode is supported on devices running the following versions of Windows:
> - [Windows 10, version 1809](https://docs.microsoft.com/windows/whats-new/whats-new-windows-10-version-1809) or later
> - [Windows Server, version 1809](https://docs.microsoft.com/windows-server/get-started/whats-new-in-windows-server-1809) or later
>
> Attack surface reduction rules that are configured in warn mode will run in block mode on devices that are running older versions of Windows.
## Notifications when a rule is triggered ## Notifications when a rule is triggered