Update attack-surface-reduction.md

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Denise Vangel-MSFT 2020-12-08 19:37:01 -08:00
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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.
> [!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