serv365.ai
06 Oct 2026
This week in Microsoft 365
28 new Message Center changes this week. The ones that matter:
New changes
Microsoft Outlook: Update to default blocked file types in OwaMailboxPolicy
MC1488841 ·
impact 4/10 medium
·
major
· Exchange Online
Action Required: Upgrade ExchangeOnlineManagement PowerShell Module to Version 3.10.1 or Later
MC1483974 ·
impact 7/10 high
·
major
· Exchange Online
Microsoft Teams: Breakout room support for Teams Rooms on Android
MC1488847 · Microsoft Teams
Private tasks now stored in your private plan in Planner
MC1488845 · Planner
Updated My Task experience in Planner
MC1488844 · Planner
Microsoft Word for Android: Agent Mode
MC1488843 · Microsoft 365 apps
(Updated) Outlook (new): Right-click to customize the classic ribbon
MC1485120 · Exchange Online
Dynamics 365 and Power Platform– Information about storage validation for Dataverse-only tenants
MC1483515 · Dynamics 365 Apps
Act-by dates in the next 30 days
13 Oct
—
Support for Office LTSC 2021, and additional apps will end on October 13, 2026
19 Oct
—
Microsoft Entra ID: Enhance protection of the authentication experience by blocking external script injection
26 Oct
—
Microsoft Entra ID: Retirement of custom CSS layout and positioning properties in company branding
02 Nov
—
(Updated) Outlook for Windows report retirement in the Exchange admin center
Incidents resolved this week
Some users may be unable to create or update Ontology artifacts in Microsoft Fabric
PB1488968 · Power BI
Users may be unable to update calendar delegates in the classic Outlook desktop client
EX1478163 · Exchange Online
Admins intermittently may be unable to access the Microsoft 365 admin center
MO1488931 · Microsoft 365 suite
Some users may see unwanted add-ins appearing automatically across all Outlook clients
EX1441488 · Exchange Online
Some users may be unable to search using the search box in SharePoint Online
SP1488394 · SharePoint Online
Users may be unable to run run-only workflows from Microsoft Teams
TM1440450 · Microsoft Teams
Reaching GA this month
Microsoft Purview: Endpoint Data Loss Prevention - Protect sensitive data over FTP and SFTP with Endpoint DLP
Dynamics 365 Contact Center: Quality evaluation - Recurring conversation evaluations
Microsoft Purview: Information Protection - Apply default SharePoint library labels to data at rest
Microsoft Purview: Credential Scanning in Data Security Posture Agent
Power Apps: Modern, refreshed look for embedded model-driven apps
Microsoft Copilot (Microsoft 365): Chat: Access to UBB models via the model selector
Microsoft Edge: Improvements to site permissions user interfaces
Microsoft Entra ID: Passkey support for B2B users
From Microsoft
Insights from the 2026 Microsoft Digital Defense Report
— Microsoft Security Blog
Preparing governments for an era of interconnected cyber risk
— Microsoft Security Blog
SharePoint Framework (SPFx) roadmap update – September 2026
— Microsoft 365 Developer Blog
Secure what’s next: Your guide to Microsoft Security at Microsoft Ignite 2026
— Microsoft Security Blog
Responsible infrastructure at hyperscale: Managing the full lifecycle of Azure hardware
— Azure Blog
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