Message Center

Notices Microsoft posts in the Microsoft 365 admin center, with the changes this installation saw between versions. Collected today from Observed in a reference Microsoft 365 tenant (Reference tenant (MVP)). Verify applicability in your own tenant's Message Center..

Graph API changes M365 roadmap

Versions captured by this deployment. Earlier versions and notices may be missing; first observed is not first published.

7Action dates in the next 30 days 9Prevent or fix issues 404Rolling out or changing 46Updated after first seen

Showing Microsoft Defender XDR only · all services

15 notices

Newest change first

MC1387578 (Updated) Microsoft Defender for Office 365: Localized default mark and notify email template
Stay informed · Microsoft Defender XDR · changed 15 Oct 2026Updated messageNew featureUser impactAdmin impact
MC1484009 (Updated) Microsoft Defender for Office 365: New email submissions data in Advanced Hunting
Stay informed · Microsoft Defender XDR · changed 9 Oct 2026Updated messageNew featureAdmin impact
MC1490909 Microsoft Defender Vulnerability Management: Private preview for selected developer package vulnerability coverage
Plan for change · Microsoft Defender XDR · changed 7 Oct 2026New featureAdmin impact
MC1279093 (Updated) Microsoft Defender for Office 365: Enhancing how we handle promotional mail
Plan for change · Microsoft Defender XDR · changed 2 Oct 2026Major changeUpdated messageNew featureUser impactAdmin impact
MC1481318 Microsoft Defender XDR: Detection source support in alert tuning rules
Stay informed · Microsoft Defender XDR · changed 28 Sep 2026New featureFeature updateAdmin impact
MC1477993 Case Management in Microsoft Defender
Stay informed · Microsoft Defender XDR · changed 23 Sep 2026New featureAdmin impact
MC1466750 Microsoft Secure Score: New AI-readiness recommendations for device security
Stay informed · Microsoft Defender XDR · changed 3 Sep 2026New featureUser impactAdmin impact
MC1422060 (Updated) Microsoft Defender for Office 365: Prompt injection protection for email
Plan for change · Microsoft Defender XDR · changed 2 Sep 2026Updated messageNew featureUser impactAdmin impact
MC1465771 Microsoft Defender XDR: DLP alerts will be set as behaviors by default
Plan for change · Microsoft Defender XDR · Microsoft Purview · changed 1 Sep 2026Major changeNew featureAdmin impact
MC1461705 Microsoft Defender XDR: Unified identity timeline on the Identity page
Plan for change · Microsoft Defender XDR · changed 25 Aug 2026New featureAdmin impact
MC1461704 Microsoft Defender XDR: Unified response actions across identity accounts
Plan for change · Microsoft Defender XDR · changed 25 Aug 2026New featureAdmin impact
MC1255406 (Updated) Microsoft Purview | Data Security Triage Agent Summaries for DLP Alerts in Microsoft Defender XDR
Plan for change · Microsoft Defender XDR · Microsoft Purview · changed 17 Aug 2026Major changeUpdated messageNew featureAdmin impact
MC1446794 Microsoft Teams: Report security concerns in Teams meetings
Plan for change · Microsoft Teams · Microsoft Defender XDR · changed 5 Aug 2026New featureUser impactAdmin impact
MC1447673 Microsoft Teams: Users can report security concerns in group calls
Plan for change · Microsoft Teams · Microsoft Defender XDR · changed 5 Aug 2026New featureUser impactAdmin impact
MC1440701 MDO Encrypted email attachment protection
Plan for change · Microsoft Defender XDR · changed 27 Jul 2026New featureAdmin impact