Microsoft Defender Antivirus compatibility with other security products

Applies to:

• Microsoft Defender Antivirus
• Microsoft Defender for Endpoint Plan 1
• Microsoft Defender for Endpoint Plan 2

Platforms

• Windows

Microsoft Defender Antivirus is available on endpoints running the following versions of Windows:

• Windows 11
• Windows 10
• Windows Server 2022
• Windows Server 2019
• Windows Server, version 1803, or newer
• Windows Server 2016

Microsoft Defender Antivirus is also available for older versions of Windows under certain conditions.

• On Windows Server 2012 R2, when onboarded using the modern, unified solution, Microsoft Defender Antivirus is installed in Active mode.

• On Windows 8.1, with System Center Endpoint Protection, enterprise-level endpoint antivirus protection is offered and managed through Microsoft Endpoint Configuration Manager.

• On consumer devices on Windows 8.1, Windows Defender is available (although it doesn't provide enterprise-level management).

If you're using non-Microsoft antivirus/antimalware software, you might be able to run Microsoft Defender Antivirus alongside the other antivirus solution. This article describes what happens with Microsoft Defender Antivirus and non-Microsoft antivirus/antimalware software, with and without Microsoft Defender for Endpoint.

Antivirus protection without Defender for Endpoint

This section describes what happens when you use Microsoft Defender Antivirus alongside non-Microsoft antivirus/antimalware products on endpoints that aren't onboarded to Defender for Endpoint.

In general, Microsoft Defender Antivirus doesn't run in passive mode on devices that aren't onboarded to Defender for Endpoint.

The following table summarizes what to expect:

If the device is onboarded to Microsoft Defender for Endpoint, you can use Microsoft Defender Antivirus in passive mode as described later in this article.

Microsoft Defender Antivirus and non-Microsoft antivirus/antimalware solutions

Whether Microsoft Defender Antivirus runs in active mode, passive mode, or is disabled depends on several factors, such as:

• The version of Windows installed on an endpoint
• Whether Microsoft Defender Antivirus is the primary antivirus/antimalware solution on the endpoint
• Whether the endpoint is onboarded to Defender for Endpoint

The following table summarizes the state of Microsoft Defender Antivirus in several scenarios.

Windows Server and passive mode

On Windows Server 2019, Windows Server, version 1803 or newer, Windows Server 2016, or Windows Server 2012 R2, Microsoft Defender Antivirus doesn't enter passive mode automatically when you install a non-Microsoft antivirus product. In those cases, set Microsoft Defender Antivirus to passive mode to prevent problems caused by having multiple antivirus products installed on a server. You can set Microsoft Defender Antivirus to passive mode using a registry key as follows:

• Path: HKLM\SOFTWARE\Policies\Microsoft\Windows Advanced Threat Protection
• Name: ForceDefenderPassiveMode
• Type: REG_DWORD
• Value: 1

You can view your protection status in PowerShell by using the command Get-MpComputerStatus. Check the value for AMRunningMode. You should see Normal, Passive, or EDR Block Mode if Microsoft Defender Antivirus is enabled on the endpoint.

For passive mode to work on endpoints running Windows Server 2016 and Windows Server 2012 R2, those endpoints must be onboarded with the modern, unified solution described in Onboard Windows servers.

On Windows Server 2016, Windows Server 2012 R2, Windows Server version 1803 or newer, Windows Server 2019, and Windows Server 2022, if you're using a non-Microsoft antivirus product on an endpoint that isn't onboarded to Microsoft Defender for Endpoint, disable/uninstall Microsoft Defender Antivirus manually to prevent problems caused by having multiple antivirus products installed on a server. However, Defender for Endpoint includes capabilities that further extend the antivirus protection that is installed on your endpoint. If you have Defender for Endpoint, you can benefit from running Microsoft Defender Antivirus alongside another antivirus solution.

For example, Endpoint detection and response (EDR) in block mode provides added protection from malicious artifacts even if Microsoft Defender Antivirus isn't the primary antivirus product. Such capabilities require Microsoft Defender Antivirus to be installed and running in passive mode or active mode.

Requirements for Microsoft Defender Antivirus to run in passive mode

In order for Microsoft Defender Antivirus to run in passive mode, endpoints must meet the following requirements:

• Operating system: Windows 10 or newer; Windows Server 2022, Windows Server 2019, or Windows Server, version 1803, or newer
  (Windows Server 2012 R2 and Windows Server 2016 if onboarded using the modern, unified solution).

• Microsoft Defender Antivirus must be installed.

• Another non-Microsoft antivirus/antimalware product must be installed and used as the primary antivirus solution. (Add Microsoft Defender for Endpoint to your exclusion list for your existing solution).

• Endpoints must be onboarded to Defender for Endpoint.

How Microsoft Defender Antivirus affects Defender for Endpoint functionality

Defender for Endpoint affects whether Microsoft Defender Antivirus can run in passive mode. And, the state of Microsoft Defender Antivirus can affect certain capabilities in Defender for Endpoint. For example, real-time protection works when Microsoft Defender Antivirus is in active or passive mode, but not when Microsoft Defender Antivirus is disabled or uninstalled.

Notes about protection states

1. When Microsoft Defender Antivirus is in passive mode, real-time protection behaves in the following ways with Microsoft Endpoint Data Loss Prevention (Endpoint DLP):

   Microsoft Defender Antivirus in passive mode	Real-time protection state
   Endpoint DLP is disabled	Disabled Doesn't provide any antivirus real-time protection blocking or enforcement.
   Endpoint DLP is enabled	Enabled for DLP specific functionalities Doesn't provide any antivirus real-time protection blocking or enforcement. Make sure to add Microsoft Defender Antivirus and Microsoft Defender for Endpoint binaries to the exclusion list of the non-Microsoft antivirus or EDR solution.

2. When Microsoft Defender Antivirus is in passive mode, scans aren't scheduled. If scans are scheduled in your configuration, the schedule is ignored. Unless:

   1. "Start the scheduled scan only when computer is on but not in use" is set to "Not configured or enabled". A Windows Task Scheduler is created unless you set "Start the scheduled scan only when computer is on but not in use" to disabled.

   2. "Turn on catch-up quick scan" is set to "Not configured or enabled". Every 30 days (default number of days) a quick catchup scan continues to occur unless "Turn on catch-up quick scan" is set to disabled. Scan tasks that are set up in Windows Task Scheduler continue to run according to their schedule. If you have scheduled tasks, you can remove them, if preferred.

   3. "Turn on scan after security intelligence update" is set to "Not configured or enabled". By default, a quick scan occurs after a "Security Intelligence Update" unless you set "Turn on scan after security intelligence update" to disabled.

3. When Microsoft Defender Antivirus is in passive mode, it doesn't remediate threats. However, Endpoint detection and response (EDR) in block mode can remediate threats. In this case, you might see alerts showing Microsoft Defender Antivirus as a source, even when Microsoft Defender Antivirus is in passive mode.

4. The security intelligence update cadence is controlled by Windows Update settings only. Defender-specific update schedulers (daily/weekly at specific time, interval-based) settings only work when Microsoft Defender Antivirus is in active mode. They're ignored in passive mode.

5. When Microsoft Defender Antivirus is in passive mode, web content filtering only works with the Microsoft Edge browser.

How to confirm the state of Microsoft Defender Antivirus

You can use one of several methods to confirm the state of Microsoft Defender Antivirus. You can:

• Use the Windows Security app to identify your antivirus app.
• Use Task Manager to confirm that Microsoft Defender Antivirus is running.
• Use Windows PowerShell to confirm that Microsoft Defender Antivirus is running.
• Use Windows PowerShell to confirm that antivirus protection is running.

Use the Windows Security app to identify your antivirus app

1. On a Windows device, open the Windows Security app.

2. Select Virus & threat protection.

3. Under Who's protecting me? select Manage providers.

4. On the Security providers page, under Antivirus, you should see Microsoft Defender Antivirus is turned on.

Use Task Manager to confirm that Microsoft Defender Antivirus is running

1. On a Windows device, open the Task Manager app.

2. Select the Details tab.

3. Look for MsMpEng.exe in the list.

Use Windows PowerShell to confirm that Microsoft Defender Antivirus is running

1. On a Windows device, open Windows PowerShell.

2. Run the following PowerShell cmdlet: Get-Process.

3. Review the results. You should see MsMpEng.exe if Microsoft Defender Antivirus is enabled.

Use Windows PowerShell to confirm that antivirus protection is running

1. On a Windows device, open Windows PowerShell.

2. Run following PowerShell cmdlet: Get-MpComputerStatus | select AMRunningMode.

3. Review the results. You should see Normal, Passive, or EDR Block Mode if antivirus protection is enabled on the endpoint.

More details about Microsoft Defender Antivirus states

The following sections describe what to expect when Microsoft Defender Antivirus is:

• In active mode
• In passive mode, or when EDR in block mode is turned on
• Disabled or uninstalled

Active mode

In active mode, Microsoft Defender Antivirus is used as the antivirus app on the machine. Settings that are configured by using Configuration Manager, Group Policy, Microsoft Intune, or other management products apply. Files are scanned, threats are remediated, and detection information is reported in your configuration tool (such as in the Microsoft Intune admin center or the Microsoft Defender Antivirus app on the endpoint).

Passive mode or EDR in block mode

In passive mode, Microsoft Defender Antivirus isn't used as the antivirus app, and threats aren't* remediated by Microsoft Defender Antivirus. However, Endpoint detection and response (EDR) in block mode can remediate threats. Files are scanned by EDR, and reports are provided for threat detections that are shared with the Defender for Endpoint service. You might see alerts showing Microsoft Defender Antivirus as a source, even when Microsoft Defender Antivirus is in passive mode.

When Microsoft Defender Antivirus is in passive mode, you can still manage updates for Microsoft Defender Antivirus; however, you can't move Microsoft Defender Antivirus into active mode if your devices have a non-Microsoft antivirus product that is providing real-time protection from malware.

Make sure to get your antivirus and antimalware updates, even if Microsoft Defender Antivirus is running in passive mode. See Manage Microsoft Defender Antivirus updates and apply baselines. Passive mode is only supported on Windows Server 2012 R2 & 2016 when the machine is onboarded using the modern, unified solution.

Disabled or uninstalled

When disabled or uninstalled, Microsoft Defender Antivirus isn't used as the antivirus app. Files aren't scanned and threats aren't remediated. Disabling or uninstalling Microsoft Defender Antivirus isn't recommended in general; if possible, keep Microsoft Defender Antivirus in passive mode if you're using a non-Microsoft antimalware/antivirus solution.

In cases where Microsoft Defender Antivirus is disabled automatically, it can be re-enabled automatically if the non-Microsoft antivirus/antimalware product expires, is uninstalled, or otherwise stops providing real-time protection from viruses, malware, or other threats. The automatic re-enabling of Microsoft Defender Antivirus helps to ensure that antivirus protection is maintained on your endpoints.

What about non-Windows devices?

If you're looking for Antivirus related information for other platforms, see:

• Set preferences for Microsoft Defender for Endpoint on macOS
• Microsoft Defender for Endpoint on Mac
• macOS Antivirus policy settings for Microsoft Defender Antivirus for Intune
• Set preferences for Microsoft Defender for Endpoint on Linux
• Microsoft Defender for Endpoint on Linux
• Configure Defender for Endpoint on Android features
• Configure Microsoft Defender for Endpoint on iOS features

See also

• Microsoft Defender Antivirus on Windows clients

• EDR in block mode

• Learn about Endpoint data loss prevention