MC1200058: Microsoft Defender for Office 365: Admins can block external users in Microsoft Teams from Defender Portal
Notice updated · Microsoft 365 Message Center Archive by Merill Fernando
Microsoft Teams, Microsoft Defender XDR
No access to your tenant or devices. Every item links to its source. What this means
Week 4 · 19 Jan – 25 Jan 2026 UTC · assess the changes, then plan the next dates.
Message CenterDefender / Teams
Notice updated · Microsoft 365 Message Center Archive by Merill Fernando
Microsoft Teams, Microsoft Defender XDR
Message CenterViva
Message CenterDefender / Intune
Message Center · Plan for change · Microsoft 365 Message Center Archive by Merill Fernando
Microsoft Intune, Microsoft Defender XDR
Microsoft marks it a major change
Message CenterDynamics 365
Message Center · Stay informed · Microsoft 365 Message Center Archive by Merill Fernando
Dynamics 365 Apps
Message CenterExchange
Message CenterMicrosoft 365 Apps
Message Center · Stay informed · Microsoft 365 Message Center Archive by Merill Fernando
Microsoft 365 apps
Message CenterMicrosoft 365 Message Center Archive by Merill Fernando
Message Center · Stay informed · Microsoft 365 Message Center Archive by Merill Fernando
Microsoft 365 suite
Message CenterPurview2 source records
Message Center · Stay informed · Microsoft 365 Message Center Archive by Merill Fernando
Microsoft Purview
Message Center · Stay informed · Microsoft 365 Message Center Archive by Merill Fernando
Microsoft Purview
Message CenterTeams
Notice updated · Microsoft 365 Message Center Archive by Merill Fernando
Microsoft Teams
RoadmapMicrosoft 365 Copilot
Roadmap entry · Microsoft 365 Roadmap · Microsoft 365 Message Center Archive by Merill Fernando
RoadmapPurview2 source records
RoadmapViva
Roadmap entry · Microsoft 365 Roadmap · Microsoft 365 Message Center Archive by Merill Fernando
Message CenterExchange
Message Center · Stay informed · Microsoft 365 Message Center Archive by Merill Fernando
Exchange Online
Message CenterIntune
Message Center · Plan for change · Microsoft 365 Message Center Archive by Merill Fernando
Microsoft Intune
Message CenterMicrosoft 365 Copilot
Notice updated · Microsoft 365 Message Center Archive by Merill Fernando
Microsoft 365 Copilot Chat
Message CenterPurview
Message Center · Stay informed · Microsoft 365 Message Center Archive by Merill Fernando
Microsoft Purview
RoadmapMicrosoft 365 Apps / Microsoft 365 Copilot4 source records
Roadmap entry · Microsoft 365 Roadmap · Microsoft 365 Message Center Archive by Merill Fernando
RoadmapMicrosoft 365 Copilot / Purview
RoadmapMicrosoft 365 Copilot2 source records
Roadmap entry · Microsoft 365 Roadmap · Microsoft 365 Message Center Archive by Merill Fernando
Roadmap entry · Microsoft 365 Roadmap · Microsoft 365 Message Center Archive by Merill Fernando
RoadmapMicrosoft 365 Roadmap
Roadmap entry · Microsoft 365 Roadmap · Microsoft 365 Message Center Archive by Merill Fernando
RoadmapPurview2 source records
Roadmap entry · Microsoft 365 Roadmap · Microsoft 365 Message Center Archive by Merill Fernando
RoadmapSharePoint
Roadmap entry · Microsoft 365 Roadmap · Microsoft 365 Message Center Archive by Merill Fernando
Updates and guidancePurview
Product news · Microsoft Purview Blog
Message CenterIntune
Groups collect records about the same product or named security topic on one UTC date. Open a record for its source and history; grouping alone does not establish a shared cause or impact.