Added Microsoft Defender documentation in defender-xdr/application-card-copilot-defender.md.
Day in brief
Security Alert Triage Agent leads 27 Defender updates
21 April 2026 recorded 3 new, 21 updated, 3 removed Microsoft Defender documentation changes. The most active areas were Defender XDR, Endpoint, Office 365.
- Security Alert Triage Agent
Defender XDR · Incidents and responseUpdated Microsoft Defender documentation in defender-xdr/security-alert-triage-agent.md.
- Attack Surface Reduction Rules Reference
Endpoint · Vulnerabilities and exposureUpdated Microsoft Defender documentation in defender-endpoint/attack-surface-reduction-rules-reference.md.
- Attack Surface Reduction Rules DeploymentEndpoint · Vulnerabilities and exposure
Updated Microsoft Defender documentation in defender-endpoint/attack-surface-reduction-rules-deployment.md.
- Attack Surface Reduction Rules OverviewEndpoint · Vulnerabilities and exposure
Updated Microsoft Defender documentation in defender-endpoint/attack-surface-reduction-rules-overview.md.
- Anti Spam Bulk Complaint Level Bcl About
Office 365 · Email and collaborationUpdated Microsoft Defender documentation in defender-office-365/anti-spam-bulk-complaint-level-bcl-about.md.
This period briefing was assembled from the tracked Microsoft Learn and Message Center changes.
27 updates
Microsoft Defender XDR
15 updatesAdded Microsoft Defender documentation in defender-xdr/application-card-copilot-defender.md.
Added Microsoft Defender documentation in defender-xdr/application-card-copilot-defender.md.
Updated Microsoft Defender documentation in defender-xdr/application-card-copilot-defender.md.
Updated Microsoft Defender documentation in defender-xdr/application-card-copilot-defender.md.
Updated Microsoft Defender documentation in defender-xdr/teams-restrictions-dexapp.md.
Updated Microsoft Defender documentation in defender-xdr/application-card-copilot-defender.md.
Updated Microsoft Defender documentation in defender-xdr/application-card-copilot-defender.md.
Updated Microsoft Defender documentation in defender-xdr/application-card-copilot-defender.md.
Updated Microsoft Defender documentation in defender-xdr/application-card-copilot-defender.md.
Removed Microsoft Defender documentation in defender-xdr/application-card-copilot-defender.md.
Removed Microsoft Defender documentation in defender-xdr/application-card-copilot-defender.md.
Removed Microsoft Defender documentation in defender-xdr/application-card-copilot-defender.md.
Updated Microsoft Defender documentation in defender-xdr/custom-detection-rules.md.
Security Alert Triage Agent
UpdatedUpdated Microsoft Defender documentation in defender-xdr/security-alert-triage-agent.md.
Microsoft Defender for Endpoint
11 updates
Linux Support Connectivity
UpdatedUpdated Microsoft Defender documentation in defender-endpoint/linux-support-connectivity.md.
Updated Microsoft Defender documentation in defender-endpoint/microsoft-defender-endpoint-releases.md.
Linux Support Connectivity
UpdatedUpdated Microsoft Defender documentation in defender-endpoint/linux-support-connectivity.md.
Evaluate Mdav Using Gp
UpdatedUpdated Microsoft Defender documentation in defender-endpoint/evaluate-mdav-using-gp.md.
Updated Microsoft Defender documentation in defender-endpoint/microsoft-defender-antivirus-compatibility.md.
Updated Microsoft Defender documentation in defender-endpoint/whats-new-in-microsoft-defender-endpoint.md.
Updated Microsoft Defender documentation in defender-endpoint/attack-surface-reduction-rules-reference.md.
Updated Microsoft Defender documentation in defender-endpoint/attack-surface-reduction-rules-deployment.md.
Updated Microsoft Defender documentation in defender-endpoint/attack-surface-reduction-rules-overview.md.
Updated Microsoft Defender documentation in defender-endpoint/attack-surface-reduction-rules-enable.md.
Updated Microsoft Defender documentation in defender-endpoint/attack-surface-reduction-rules-deployment-test.md.
Updated Microsoft Defender documentation in defender-office-365/anti-spam-bulk-complaint-level-bcl-about.md.