Welcome to my Blog about Microsoft Office 365 and other technologies ! – Technology is just a tool. People need to be creative to be more productive on a daily basis. (by Nuno Árias Silva)
In a rapid change of Office 365, Microsoft sends to Tenant Admin’s the news about what is changing and what is coming in Office 365.
This is the 447th email that Microsoft has sent to Tenant Admin’s Newsletter with Office 365 changes.
Resume “Summary” from Microsoft 365 Copilot:
Microsoft 365 Message center announced that Microsoft Defender for Cloud Apps SIEM agents will retire, with no new agents configurable after June 19, 2025, and advised transitioning to unified APIs and SIEM solutions; rollout is paused.
Microsoft 365 Copilot in Word introduces Agent Mode, rolling out Nov 17, 2025–Jan 2026, enabling conversational content creation and editing; no admin action required.
Microsoft Defender Threat Intelligence will merge with Microsoft Defender and Sentinel by August 1, 2026; organizations must update licenses and transition before the deadline.
Dynamics 365 Customer Service will allow simulation of AI field prediction from Jan 23, 2026, and Microsoft 365 Copilot for Service will enable one-click case creation from Outlook emails starting Jan 1, 2026.
Microsoft 365 Copilot app for Windows will show a non-blocking “Update” button from Jan 2026; no admin action needed.
Microsoft Foundry will integrate with Purview for AI data management, with public preview mid-Dec 2025 and worldwide rollout mid-March 2026.
New Outlook for Windows will offer a customizable oversharing dialog for DLP, rolling out from Jan 2026, off by default.
Agent Mode in Excel for Windows and Mac rolls out mid-Jan to early Mar 2026, enabling natural language workbook interaction; no admin action needed.
Microsoft Purview Data Loss Prevention will decouple policy tips and email notifications for SharePoint and OneDrive, with rollout starting Feb 20, 2026, and GA in March 2026.
Microsoft Teams Rooms on Android will introduce Adaptive Front-of-Room Experience for Town Halls, rolling out Dec 2025–Feb 2026; requires Teams Rooms Pro license and device updates.
This Weekly digest is intended to reach the Administrators of Microsoft Office 365 within the latest changes that are happening to Office 365.
Below is an example that can be applied to your tenant, because these emails are based on the services that you have in your Tenant and subscription.
View a summary of the updates.
Message center announcements
December 22, 2025 – December 28, 2025
Major updates
(Updated) Microsoft Defender for Cloud Apps: SIEM agents will retire
MC1077861 | December 23 – Microsoft Defender for Cloud Apps will retire SIEM agents, with no new agents configurable after June 19, 2025. The rollout is paused, and users are advised to transition to unified APIs and SIEM solutions for alerts and activity data to ensure continuity and enhanced capabilities. View more
(Updated) Use Microsoft Copilot in Word to create, edit, and transform content directly from chat
MC1129126 | December 22 – Microsoft 365 Copilot in Word introduces Agent Mode, enabling users to create and edit content conversationally and iteratively. Rollout starts November 17, 2025, completing by January 2026. Users with licenses can make direct changes on Word, with no admin action required. View more
(Updated) Microsoft Defender Threat Intelligence: Convergence with Microsoft Defender and Microsoft Sentinel
MC1192257 | December 22 – Microsoft Defender Threat Intelligence is merging with Microsoft Defender and Microsoft Sentinel by August 1, 2026, offering integrated threat insights and enhanced analytics. Post-transition, MDTI requires an active Defender or Sentinel license. Organizations should prepare by updating licenses, documentation, and transitioning before the deadline. View more
Additional updates
Dynamics 365 Customer Service – Simulate AI field prediction capability from Case Management Agent
MC1204658 | December 24 – We are announcing the ability to test how well the Case Management Agent is performing with field prediction in Dynamics 365 Customer Service. This feature will reach general availability on January 23, 2026.How does this affect me?Simulation helps admins understand how Case Management Agent would perform field prediction so that they can evaluate quality checks and make determinations about the enablement of this feature in production. Admins can choose historical case… View more
Microsoft 365 Copilot for Service – Create case records from customer emails with one click
MC1204498 | December 24 – We are announcing the ability to create case records from customer emails within Outlook in Microsoft 365 Copilot for Service. This feature will reach general availability on January 1, 2026.How does this affect me?This feature provides the following functionality:One-click case creation: When you view a customer email in Outlook, you can leverage the Copilot for Service side panel to instantly create a new case.Automatic data capture:… View more
(Updated) Microsoft 365 Copilot App for Windows: “Update available” button
MC1154790 | December 23 – Starting January 2026, the Microsoft 365 Copilot app for Windows will show a non-blocking “Update” button in the top-right corner when a new version is available. Users can update immediately or later without interrupting app use. No admin action is needed; communicate this change to users. View more
Microsoft Purview | Microsoft Foundry integration with Microsoft Purview for AI
MC1202976 | December 22 – Microsoft Foundry integrates with Microsoft Purview to enable secure management and compliance of AI-generated data. Admins can opt-in to send AI interaction data to Purview for classification, reporting, risk management, and eDiscovery. Public preview starts mid-December 2025; worldwide rollout begins mid-March 2026. View more
Microsoft Outlook: Customizable oversharing dialog for DLP in New Outlook
MC1202974 | December 22 – New Outlook for Windows will offer a customizable oversharing dialog for DLP, allowing admins to tailor messages with multi-language support, business justifications, and dynamic tokens. Rolling out globally from January 2026, the feature is off by default and configurable via the Compliance portal. View more
Agent Mode in Excel for Windows and Mac
MC1202968 | December 22 – Agent Mode in Microsoft 365 Copilot for Excel (Windows and Mac) enables natural language interaction to build and edit workbooks, integrates web search for updated data, and supports Claude AI models. It rolls out worldwide from mid-January to early March 2026, requires no admin action, and respects existing data access settings. View more
(Updated) Data Loss Prevention: Decoupling policy tips and email notifications for SharePoint and OneDrive
MC791114 | December 22 – Microsoft Purview Data Loss Prevention will decouple policy tips and user email notifications, allowing admins to configure either or both independently via PowerShell or the DLP portal. Rollout begins February 20, 2026, with general availability in March 2026. No pre-rollout admin action is needed. View more
(Updated) Microsoft Teams Rooms: Front-of-room view control for Town Halls on Android
MC1182706 | December 22 – Microsoft Teams Rooms on Android will introduce an Adaptive Front-of-Room Experience for Town Halls, requiring a Teams Rooms Pro license. It offers distraction-free attendee views and full presenter control, rolling out from December 2025 to February 2026. Organizations should prepare by updating licenses, devices, and communications. View more
(Updated) Microsoft Teams: In channels, the “Shared” tab (formerly the “Files” tab) will have new capabilities
MC1025217 | December 22 – The Teams “Files” tab in channels will be renamed “Shared,” combining shared post content and document library files. Rolling out Nov 2025–Jan 2026, it offers views by posts and library, file ordering, and filtering. No admin action needed; user notification is recommended. View more
You’re subscribed to this email. If you’re an IT admin, you’re subscribed by default, but you can unsubscribe at any time. If you’re not an IT admin, ask your admin to remove your email address from Microsoft 365 message center preferences.
This email might not include all Microsoft service updates from the past week. The content you see is based on the Microsoft services available to your organization, and the custom view and email options you (or your admin) select in Microsoft 365 message center preferences.
Note: My Tenant is based in Europe with Target Release Enabled. You can view more messages on your portal, just go to the Message center.
Quickly access relevant information and functionality from the new home page—The home page has been redesigned with you and your most common tasks in mind—such as adding a user or resetting a password. The new admin center makes these items accessible directly from the home page. The home page also proactively surfaces information important to you, such as notifications from the Message Center.
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