MC1187776: Updates available for Microsoft 365 Apps for Current Channel
We've released updates to the following update channel for Microsoft
Microsoft 365 Message Center
An archive of Message Center updates - curated and preserved for when Microsoft changes things faster than you can say "rolling out." Find the latest and past Message Center posts right here. Updated daily at 1am (UK time).
MC1185931: Secure Boot playbook for certificates expiring in 2026
🚨Major Update: This post contains a significant change that may impact your
MC1187707: Microsoft Copilot Studio - Copy an agent in Copilot Studio Lite to the Copilot Studio full experience
Update: Release of this feature has been updated.
We are announcing the
MC1187682: Microsoft Edge: Microsoft 365 Copilot will support summarization and contextual grounding
Microsoft Edge for Business will support Microsoft 365 Copilot Chat to summarize and provide context from browser tabs, Microsoft 365 documents, and YouTube videos starting mid-November 2025. The feature is off by default, respects DLP and policy settings, and requires Entra ID sign-in and approp...
MC1187679: Microsoft Teams: Protection against tenant-owned domain impersonation in Teams chat
Microsoft Teams will soon detect and warn users of tenant-owned domain impersonation in external chats, displaying high-risk alerts when suspicious. This feature, enabled by default for organizations allowing external access, launches December 2025 across all platforms with no admin controls or r...
MC1187677: Microsoft 365 Copilot: Navigation refresh in the M365 Copilot app
The Microsoft 365 Copilot app will have a simplified, flattened navigation menu with logically grouped features. The rollout starts mid-November 2025 for targeted release and December 2025 for general availability, completing by January 2026. No admin action is required.
MC1187676: Learning agent in Frontier
The Learning agent is now available in Frontier, offering personalized microlearning and Copilot tips within Microsoft 365 tools. It’s deployable via the Copilot Control Center, requires Microsoft 365 Copilot licensing, and is opt-in for admins. Frontier features are experimental and subject to c...
MC1187675: Introducing Workforce Insights agent in Frontier for Microsoft 365 Copilot
The Workforce Insights agent, launching November 24, 2025, in Frontier for Microsoft 365 Copilot, helps leaders analyze staffing, skills, and organizational structure using organizational and people skills data. Available to organizations with 50+ Copilot licenses, it supports deployment control ...
MC1187671: New features coming to Microsoft 365 Copilot Chat for Outlook, Word, Excel, and PowerPoint
Microsoft 365 Copilot Chat will expand Outlook support to entire inbox and calendar, add Agent Mode in Word, Excel, and PowerPoint using web data and referenced files, and introduce specialized agents powered by Anthropic’s Claude model. Rollout starts January 2026; no admin action required excep...
MC1187403: Automatic Windows event auditing configuration now available for unified sensors (V3.x)
Defender for Identity unified sensors (V3.x) will offer an opt-in feature from mid-Nov 2025 to automatically configure Windows event-auditing settings, simplifying deployment and ensuring consistent policies. Admins must enable this feature manually; it applies to all sensors and addresses specif...
MC1187401: Microsoft dark themes for SharePoint sites
Two new Microsoft-designed dark themes (Dark Teal, Dark Blue) will be available for SharePoint sites starting mid-December 2025. They enhance visual experience, support accessibility, and can be applied via site settings without affecting existing themes or functionality. No admin action is neede...
MC1187400: Syncing HiddenFromAddressListEnabled attribute across tenants for consistent Global Address List (GAL) visibility
The HideFromAddressListEnabled attribute will now sync across tenants via Entra Cross Tenant Sync, ensuring consistent Global Address List visibility. The update rolls out late November to mid-December 2025 automatically, requiring no admin action and not affecting mail flow or sign-in.