Microsoft Defender for Endpoint

Msda Updates Previous Versions Technical Upgrade Support

4 September 2026Doc update+3 / −3 lines

In brief

The page now links to updated WDAC, SmartScreen, and Windows Update documentation locations.

What Defender admins need to know

No administrator action is indicated.

Summaries are generated from the documentation change itself.

Documentation change

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What's new

Fixed issue where Microsoft Defender Antivirus was not properly changing state when non-Microsoft antivirus/antimalware software was installed and ~~Windows Defender Application Control~~Windows Defender Application Control (WDAC) with ~~Intelligent Security Graph~~Intelligent Security Graph were enabled.
Fixed deadlock issue on VDI that occurred when loading corrupted update files from UNC share.
Custom scans started with Start-MpScan are now reported in the event log.
Fixed potential deadlock that occurred on volume mount scanning.

What's new

Improved ~~SmartScreen~~SmartScreen status support logging

Known issues

has a reboot flag for systems that have hanging issues;

is re-released in April 2020 and will not be superseded by newer updates to keep future availability;

is categorized as an update due to the reboot requirement; and

is only be offered with ~~Windows Update~~Windows Update.

November-2019 (Platform: 4.18.1911.3 | Engine: 1.1.16600.7)

@@ -342,7 +342,7 @@ What's new  #### What's new -- Fixed issue where Microsoft Defender Antivirus was not properly changing state when non-Microsoft antivirus/antimalware software was installed and [Windows Defender Application Control](/windows/security/application-security/application-control/windows-defender-application-control/wdac) (WDAC) with [Intelligent Security Graph](/windows/security/application-security/application-control/windows-defender-application-control/design/use-wdac-with-intelligent-security-graph) were enabled.+- Fixed issue where Microsoft Defender Antivirus was not properly changing state when non-Microsoft antivirus/antimalware software was installed and [Windows Defender Application Control](/windows/security/application-security/application-control/app-control-for-business/appcontrol) (WDAC) with [Intelligent Security Graph](/windows/security/application-security/application-control/app-control-for-business/design/use-appcontrol-with-intelligent-security-graph) were enabled. - Fixed deadlock issue on [VDI](deployment-vdi-microsoft-defender-antivirus.md) that occurred when loading corrupted update files from UNC share. - Custom scans started with [Start-MpScan](/powershell/module/defender/start-mpscan) are now reported in the event log. - Fixed potential deadlock that occurred on volume mount scanning.@@ -1206,7 +1206,7 @@ What's new  #### What's new -- Improved [SmartScreen](/windows/security/threat-protection/microsoft-defender-smartscreen/microsoft-defender-smartscreen-overview) status support logging+- Improved [SmartScreen](/windows/security/operating-system-security/virus-and-threat-protection/microsoft-defender-smartscreen/) status support logging  #### Known issues @@ -1419,7 +1419,7 @@ What's new > - has a reboot flag for systems that have hanging issues; > - is re-released in April 2020 and will not be superseded by newer updates to keep future availability; > - is categorized as an update due to the reboot requirement; and-> - is only be offered with [Windows Update](https://support.microsoft.com/help/4027667/windows-10-update).+> - is only be offered with [Windows Update](https://support.microsoft.com/Windows/Deployment/Updates-Lifecycle/install-windows-updates).  ### November-2019 (Platform: 4.18.1911.3 | Engine: 1.1.16600.7)