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Week in brief

Security Copilot M365d Incident Summary leads 114 Defender updates

Week of 6 April 2026 recorded 5 new, 108 updated Microsoft Defender documentation changes and 1 relevant Message Center announcement. The most active areas were Endpoint, Defender XDR, Office 365.

  • Defender XDR · Incidents and response
    Security Copilot M365d Incident Summary

    Updated Microsoft Defender documentation in defender-xdr/security-copilot-m365d-incident-summary.md.

  • Vulnerability Management · Vulnerabilities and exposure
    Fixed Reported Inaccuracies

    Updated Microsoft Defender documentation in defender-vulnerability-management/fixed-reported-inaccuracies.md.

  • Identity · Identity protection
    Accounts

    Updated Microsoft Defender documentation in defender-for-identity/security-posture-assessments/accounts.md.

  • Endpoint · Vulnerabilities and exposure
    Attack Surface Reduction Rules Enable

    Updated Microsoft Defender documentation in defender-endpoint/attack-surface-reduction-rules-enable.md.

  • Cloud Apps · Cloud and workloads
    Enable Instant Visibility Protection And Governance Actions For Your Apps

    Updated Microsoft Defender documentation in defender-for-cloud-apps/enable-instant-visibility-protection-and-governance-actions-for-your-apps.md.

For Defender administrators

Review the linked Microsoft Learn changes that apply to your managed platforms, policies, applications, and rollout plans. The archive preserves the source diff for verification.

This period briefing was assembled from the tracked Microsoft Learn and Message Center changes.

Updates this week

General

30

Defender Security For Ai

Updated

Updated Microsoft Defender documentation in defender-xdr/security-for-ai/defender-security-for-ai.md.

12 April 2026

Defender Security For Ai

Updated

Updated Microsoft Defender documentation in defender-xdr/security-for-ai/defender-security-for-ai.md.

12 April 2026

Defender Security For Ai

Updated

Updated Microsoft Defender documentation in defender-xdr/security-for-ai/defender-security-for-ai.md.

12 April 2026

Multitenant Governance

Updated

Updated Microsoft Defender documentation in defender-xdr/multitenant-governance.md.

12 April 2026

Ai Agent Inventory

Updated

Updated Microsoft Defender documentation in defender-xdr/security-for-ai/ai-agent-inventory.md.

9 April 2026

Ai Agent Inventory

Updated

Updated Microsoft Defender documentation in defender-xdr/security-for-ai/ai-agent-inventory.md.

9 April 2026

Defender Security For Ai

Updated

Updated Microsoft Defender documentation in defender-xdr/security-for-ai/defender-security-for-ai.md.

9 April 2026

Ai Agent Inventory

Updated

Updated Microsoft Defender documentation in defender-xdr/security-for-ai/ai-agent-inventory.md.

9 April 2026

Defender Security For Ai

Updated

Updated Microsoft Defender documentation in defender-xdr/security-for-ai/defender-security-for-ai.md.

9 April 2026

Ai Agent Inventory

Updated

Updated Microsoft Defender documentation in defender-xdr/security-for-ai/ai-agent-inventory.md.

9 April 2026

Ai Agent Inventory

Updated

Updated Microsoft Defender documentation in defender-xdr/security-for-ai/ai-agent-inventory.md.

9 April 2026

Defender Security For Ai

Updated

Updated Microsoft Defender documentation in defender-xdr/security-for-ai/defender-security-for-ai.md.

9 April 2026

Defender Security For Ai

Updated

Updated Microsoft Defender documentation in defender-xdr/security-for-ai/defender-security-for-ai.md.

9 April 2026

Whats New

Updated

Updated Microsoft Defender documentation in defender-xdr/whats-new.md.

7 April 2026

Compare Rbac Roles

Updated

Updated Microsoft Defender documentation in defender-xdr/compare-rbac-roles.md.

7 April 2026

Custom Permissions Details

Updated

Updated Microsoft Defender documentation in defender-xdr/custom-permissions-details.md.

7 April 2026

Hunting and detection

4

Incidents and response

4

Alert Policies

Updated

Updated Microsoft Defender documentation in defender-xdr/alert-policies.md.

9 April 2026

Architecture and deployment

2

Endpoint protection

1

Upcoming retirement of older Microsoft Defender for Endpoint mobile app versions (iOS and Android)

New

Microsoft will retire Microsoft Defender for Endpoint mobile app versions released before February 2026 on iOS and Android starting May 10, 2026. Older versions will lose cloud connectivity and updates. Administrators must ensure devices update to supported versions to maintain protection and avoid service disruption.

10 April 2026
Message CenterMC1276511 on mc.merill.net ↗Major updatePlan for change

Endpoint protection

33

Android Support Signin

Updated

Updated Microsoft Defender documentation in defender-endpoint/android-support-signin.md.

12 April 2026

Android Support Signin

Updated

Updated Microsoft Defender documentation in defender-endpoint/android-support-signin.md.

12 April 2026

Mde Linux Prerequisites

Updated

Updated Microsoft Defender documentation in defender-endpoint/mde-linux-prerequisites.md.

11 April 2026

Run Analyzer Linux

Updated

Updated Microsoft Defender documentation in defender-endpoint/run-analyzer-linux.md.

9 April 2026

Run Analyzer Linux

Updated

Updated Microsoft Defender documentation in defender-endpoint/run-analyzer-linux.md.

9 April 2026

Mtd

Updated

Updated Microsoft Defender documentation in defender-endpoint/mtd.md.

9 April 2026

Respond Machine Alerts

Updated

Updated Microsoft Defender documentation in defender-endpoint/respond-machine-alerts.md.

9 April 2026

Run Av Scan

Updated

Updated Microsoft Defender documentation in defender-endpoint/api/run-av-scan.md.

9 April 2026

Android Configure

Updated

Updated Microsoft Defender documentation in defender-endpoint/android-configure.md.

9 April 2026

Android Configure Mam

Updated

Updated Microsoft Defender documentation in defender-endpoint/android-configure-mam.md.

9 April 2026

Deployment Strategy

Updated

Updated Microsoft Defender documentation in defender-endpoint/deployment-strategy.md.

9 April 2026

Mde P1 Setup Configuration

Updated

Updated Microsoft Defender documentation in defender-endpoint/mde-p1-setup-configuration.md.

9 April 2026

Respond Machine Alerts

Updated

Updated Microsoft Defender documentation in defender-endpoint/respond-machine-alerts.md.

9 April 2026

Switch To Mde Phase 3

Updated

Updated Microsoft Defender documentation in defender-endpoint/switch-to-mde-phase-3.md.

9 April 2026

Run Av Scan

Updated

Updated Microsoft Defender documentation in defender-endpoint/api/run-av-scan.md.

8 April 2026

Android Configure

Updated

Updated Microsoft Defender documentation in defender-endpoint/android-configure.md.

8 April 2026

Android Configure Mam

Updated

Updated Microsoft Defender documentation in defender-endpoint/android-configure-mam.md.

8 April 2026

Deployment Strategy

Updated

Updated Microsoft Defender documentation in defender-endpoint/deployment-strategy.md.

8 April 2026

Mde P1 Setup Configuration

Updated

Updated Microsoft Defender documentation in defender-endpoint/mde-p1-setup-configuration.md.

8 April 2026

Switch To Mde Phase 3

Updated

Updated Microsoft Defender documentation in defender-endpoint/switch-to-mde-phase-3.md.

8 April 2026

Mtd

Updated

Updated Microsoft Defender documentation in defender-endpoint/mtd.md.

7 April 2026

Configure Endpoints Vdi

Updated

Updated Microsoft Defender documentation in defender-endpoint/configure-endpoints-vdi.md.

7 April 2026

Mac Schedule Scan

Updated

Updated Microsoft Defender documentation in defender-endpoint/mac-schedule-scan.md.

6 April 2026

Configure Proxy Internet

Updated

Updated Microsoft Defender documentation in defender-endpoint/configure-proxy-internet.md.

6 April 2026

Vulnerabilities and exposure

11

Email and collaboration

14

Mdo Email Entity Page

Updated

Updated Microsoft Defender documentation in defender-office-365/mdo-email-entity-page.md.

7 April 2026

Mdo Support Teams About

Updated

Updated Microsoft Defender documentation in defender-office-365/mdo-support-teams-about.md.

7 April 2026

Mdo Support Teams About

Updated

Updated Microsoft Defender documentation in defender-office-365/mdo-support-teams-about.md.

7 April 2026

Identity protection

6

Accounts

Updated

Updated Microsoft Defender documentation in defender-for-identity/security-posture-assessments/accounts.md.

9 April 2026

Prerequisites Sensor Version 3

Updated

Updated Microsoft Defender documentation in defender-for-identity/deploy/prerequisites-sensor-version-3.md.

9 April 2026

Prerequisites Sensor Version 3

Updated

Updated Microsoft Defender documentation in defender-for-identity/deploy/prerequisites-sensor-version-3.md.

9 April 2026

Prerequisites Sensor Version 3

Updated

Updated Microsoft Defender documentation in defender-for-identity/deploy/prerequisites-sensor-version-3.md.

9 April 2026

Prerequisites Sensor Version 3

Updated

Updated Microsoft Defender documentation in defender-for-identity/deploy/prerequisites-sensor-version-3.md.

8 April 2026

Prerequisites Sensor Version 3

Updated

Updated Microsoft Defender documentation in defender-for-identity/deploy/prerequisites-sensor-version-3.md.

8 April 2026

Cloud and workloads

3

General

2

Fixed Reported Inaccuracies

Updated

Updated Microsoft Defender documentation in defender-vulnerability-management/fixed-reported-inaccuracies.md.

9 April 2026

Tvm Remediation

Updated

Updated Microsoft Defender documentation in defender-vulnerability-management/tvm-remediation.md.

8 April 2026

Vulnerabilities and exposure

1

Fixed Reported Inaccuracies

Updated

Updated Microsoft Defender documentation in defender-vulnerability-management/fixed-reported-inaccuracies.md.

9 April 2026

Endpoint protection

1

Mdb Mtd

Updated

Updated Microsoft Defender documentation in defender-business/mdb-mtd.md.

6 April 2026

General

2

Gov Support

Updated

Updated Microsoft Defender documentation in unified-secops-platform/gov-support.md.

10 April 2026

Microsoft Threat Actor Naming

Updated

Updated Microsoft Defender documentation in unified-secops-platform/microsoft-threat-actor-naming.md.

10 April 2026