serv365.ai
20 Oct 2026
This week in Microsoft 365
36 new Message Center changes this week. The ones that matter:
New changes
Microsoft OneDrive: Copilot actions in the File Explorer context menu are being retired
MC1515940 ·
impact 5/10 high
·
major
· Microsoft OneDrive
(Updated) Windows updates are available for 2026 time zone changes in Canada
MC1510951 ·
impact 5/10 high
·
major
· Exchange Online, Microsoft 365 suite
Microsoft Teams: Upcoming change to voicemail message delivery by email
MC1511072 ·
impact 4/10 medium
·
major
· Exchange Online, Microsoft Teams
Action required: Review property changes for Exchange Online scenarios
MC1511071 ·
impact 9/10 critical
·
major
· Exchange Online
Microsoft Copilot Studio – Teams app retirement
MC1511056 ·
impact 5/10 high
·
major
· Microsoft Teams
(Updated) Microsoft Teams: Video sharing from OneDrive in Teams events
MC1506734 ·
impact 4/10 medium
·
major
· Microsoft Teams
Sending from Aliases
MC1515939 · Exchange Online
Microsoft Purview | eDiscovery: In-product diagnostics to troubleshoot common challenges
MC1515937 · Microsoft Purview
Act-by dates in the next 30 days
26 Oct
—
Microsoft Entra ID: Retirement of custom CSS layout and positioning properties in company branding
31 Oct
—
Microsoft 365: Targeted Release retirement
02 Nov
—
(Updated) Outlook for Windows report retirement in the Exchange admin center
06 Nov
—
(Updated) Microsoft Entra ID SSPR will require registered authentication methods starting November 9, 2026
15 Nov
—
Action required: Review property changes for Exchange Online scenarios
17 Nov
—
Database Hub in Fabric: Default enablement and admin opt-out
Incidents resolved this week
Some users may be unable to join town hall meetings in Microsoft Teams and are redirected to a registration page
TM1514781 · Microsoft Teams
Users and admins couldn't view or manage device group configurations through the Microsoft Defender portal
MO1515549 · Microsoft 365 suite
Some users may be unable to see GPT within the model selection options in Microsoft 365 Copilot chat
CW1514746 · Microsoft 365 Copilot Chat
Some users may have been unable to send messages in Microsoft 365 Copilot chat
CW1515013 · Microsoft 365 Copilot Chat
Some users may be unable to access or protect content using Azure Rights Management (ARM) across Microsoft 365 services
OP1514821 · Microsoft 365 apps
Some users may have experienced intermittent failures with sensitivity-labeled items in Microsoft Fabric
PB1514788 · Power BI
Reaching GA this month
Microsoft Copilot (Microsoft 365): Copilot in PowerPoint for Government clouds
Outlook: Duplicate events in Outlook mobile apps
Microsoft Copilot (Microsoft 365): Edit your document with Copilot in PowerPoint in Government Clouds
Microsoft Copilot (Microsoft 365): Edit with Copilot in Excel (Web, Win32, Mac) - GCC
Microsoft Copilot Studio: Support for sensitive documents protected with Microsoft Purview Information Protection (MPIP)
Microsoft Purview: Data Loss Prevention for Microsoft Cowork
Outlook: Send availability in Outlook mobile apps
Microsoft Viva: Engage Community feed improvements
From Microsoft
Agents are your newest insiders. Security must move at their speed.
— Microsoft Security Blog
Managing open-weight model risk in enterprise deployments
— Azure Blog
Managing open-weight model risk in enterprise deployments
— Microsoft Security Blog
Evolving the cloud-native foundation for the next generation of AI
— Azure Blog
Microsoft named a Leader in the 2026 Gartner® Magic Quadrant™ for Server Virtualization Platforms
— Azure Blog
Does this affect your tenant? Connect it ›
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