MC1184591: Power Platform - Upcoming enforcement of tenant isolation
As part of our Secure Future Initiative (SFI), the tenant isolation feature
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).
MC1184506: Finance and operations apps - Rotate SSL certificates on your cloud-hosted environments by November 15
We have determined that a subset of SSL certificates issued between July
MC1184429: Microsoft Teams: Channel Agent Feature Updates
Microsoft Teams' Channel Agent, a Copilot-powered assistant, is updated to support file-based grounding from Channel SharePoint, enhanced task and report management, GitHub MCP integration, and multilingual support. Rollout starts mid-November 2025, requiring no admin action but allowing admin co...
MC1184413: Microsoft 365 Copilot for Android: Preview and chat with Word, Excel, and PowerPoint files in the Copilot app
Microsoft 365 Copilot for Android preview lets users open Word, Excel, and PowerPoint files with Copilot Chat for summaries. Editing requires switching to standalone apps. Offline access and advanced file management move to standalone apps. Rollout starts mid-November 2025, completing by mid-Janu...
MC1184412: Maintain accurate presence in Teams on the Web with new activity detection setting
Microsoft Teams on the web will introduce a new user-enabled setting to detect device activity beyond the Teams tab, improving presence accuracy. Rolling out December 2025 for Chrome v94+ and Edge v114+. No admin action needed; users must grant browser permission to enable it.
MC1184410: Microsoft Outlook for iOS/Android: Automatic replies collapsed by default in email thread
Outlook for iOS and Android will automatically collapse automatic replies in email threads by default starting December 2025. Users can expand these replies if needed. This change applies to all users, requires no configuration, and does not affect message delivery or reply behavior.
MC1184409: Microsoft 365 Copilot: People agent now available in Frontier
Microsoft 365 Copilot’s People agent, launching in Frontier with public preview in November 2025 and general availability in Q1 2026, helps users discover organizational insights from emails, chats, meetings, and documents. Admins control deployment and access via Microsoft Entra ID groups; users...
MC1184408: Agent mode in Excel generally available soon (formerly part of the Frontier program)
Agent mode in Excel, formerly part of the Frontier program, will be generally available worldwide from early December 2025 to late February 2026. It allows Microsoft 365 Copilot-licensed users to build and edit workbooks alongside AI, supporting tables, charts, PivotTables, and formulas without a...
MC1184407: App Skills in Excel will be retired
App Skills in Excel will be retired starting December 2025, replaced by Agent Mode in Excel for a streamlined experience. All Microsoft 365 Copilot Excel users will lose App Skills access. No admin action is needed; users should explore Agent Mode and update documentation accordingly.
MC1184322: Power Pages - Power Pages version 9.7.9.xx Hotfix Release
Maintenance window start: November 12, 2025, at 6:00 PM UTC
Maintenance
MC1184033: Power Pages - Security scan recommendations in Security Hub
We are announcing the availability of security scan recommendations in Security Hub
MC1183612: Action Required to Enable Extended Security Update for local devices accessing Windows 365
🚨Major Update: This post contains a significant change that may impact your