

Customers should still keep Microsoft Defender Antivirus up to date even when it is in passive mode via Security intelligence updates and product updates. Important: Real-time protection and threats will not be remediated by Microsoft Defender Antivirus while it is in passive mode.
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Windows 10 client devices that are enrolled with Microsoft Defender for Endpoint and have a non-Microsoft antivirus solution as primary AV, Microsoft Defender Antivirus operates in passive mode, allowing the primary AV to do real-time protection. (See 11 reasons to use Microsoft Defender Antivirus together with Microsoft Defender for Endpoint.) Having a secondary AV in place will disable Microsoft Defender Antivirus and all this backend support. When DART arrives on site, often the first question from the customer is "why didn't Defender stop this?" Microsoft Defender Antivirus has entire teams dedicated to threat intel updates, real time analysis, and detection support. Identifying the current AV solution in place, and any secondary support, is imperative to understanding what level of protection you have, and which solutions are turned on and actively protecting your organization.

However, on endpoints protected with a non-Microsoft antivirus (AV) or antimalware application, Microsoft Defender Antivirus will automatically disable itself. On Windows 10 devices, Microsoft Defender Antivirus is shipped as part of the OS and is enabled by default. Understanding the effect of third-party antivirus and Microsoft Defender Antivirus coexistence Consider these recommendations and decide whether they are being applied, or whether sufficient justification against implementing these recommendations exists.

Note: The information in this post is recommended for administrators, such as security architects, support staff, and leadership, who deal with security solutions. Understanding this can help you prioritize your security controls and processes. In this blog, we would like to share lessons learned from commonly seen gaps specific to endpoint security. The Microsoft Detection and Response Team (DART) wants to help all organizations avoid common mistakes and issues we see when handling customers' security incidents and breaches. Unfortunately, a focus heavily weighted too far on convenience can result in massive security incidents and data breaches. In the world of security, the scale has typically leaned towards convenience for the purpose of business operability and efficiency. The scale tips and topples when one side outweighs the other. Having the right cybersecurity strategy requires a delicate balance between protection and convenience.
