The September 2025 Windows security update is now available

The September 2025 security update is now available for all supported versions of Windows. We recommend that you install these updates promptly. For more information about the contents of this update, see the release notes, which are easily accessible from the Windows 11 and Windows 10 update history pages. To learn more about the different types of monthly quality updates, see Windows monthly updates explained.

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Certificate-based authentication changes following installation of Windows updates released September 9, 2025

Windows updates released September 9, 2025 and later, introduce security hardening changes to certificate mapping requirements in Windows Servers. The is the final milestone of a rollout that has gradually been taking place since 2023. IT administrators need to take action to ensure normal operations in accordance with the new certificate mapping criteria, and install the September 9, 2025 updates.

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Microsoft Defender for Office 365: Agentic AI Phish Submission Analysis & Response

We are introducing Advanced Agentic AI grading system integrated into the native MDO submission analysis and response workflow. This integration allows for prompt, detailed verdicts with natural language explanations when customers report phishing messages to Microsoft.

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Microsoft Copilot (Microsoft 365): Microsoft Graph APIs for App & Agent Inventory and Details

Microsoft 365 will introduce new Graph API endpoints designed to empower IT administrators and developers with robust programmatic access to app and agent management across Copilot, Teams, Outlook, and other MetaOS hosts.
Key Features:
• Inventory API: Retrieve a comprehensive inventory of all apps and agents within your tenant, with advanced filtering by type (1P, 3P, LOB, Shared), host (Copilot, Outlook, Teams, Office), last updated date, and more. This enables bulk management, compliance checks, and streamlined governance for large organizations.
• Details API: Access detailed metadata for any specific app or agent, including availability, deployment status, supported hosts, creator information, version, sensitivity, categories, and capabilities (such as Graph connectors, knowledge sources, and plugin actions). This supports auditing, lifecycle management, and integration into existing IT workflows.

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Microsoft Teams: Improvements in call transfer experience on Teams Phone devices

New call controls and streamlined transitions enable simple and seamless transfers for Teams Phone users on Android devices.

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Microsoft Intune: Recovery Lock management for macOS

This feature adds the ability to manage the password used to access the macOS recovery partition. Configuring a recovery OS password prevents users from booting company-owned devices into recovery mode, reinstalling macOS, and bypassing remote management.

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Microsoft Defender for Office 365: Message Warnings for Messages with Malicious URL in Teams

Messages in Teams that contain malicious URLs will now be automatically detected, and a warning will be displayed directly on the message.

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Microsoft 365 admin center: Agent metadata in inventory export

Agent metadata export in Microsoft 365 admin center includes expanded metadata fields, covering Capabilities, Data Sources, Actions, Created In, and Created By. Enables enhanced visibility for auditing, governance, and lifecycle tracking.

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Microsoft Teams: Mute a conversation from Teams for iOS & Android

Engage network admins and corporate communicators can mute conversations to remove a thread from distribution in the home feed and in email digests directly from the Engage app in Teams for iOS & Android.

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Microsoft 365 admin center: Agent Ownership Reassignment

Admins can reassign ownership of shared agents created within the organization through tools such as Copilot Studio or the Microsoft 365 Agents Toolkit. Once reassigned, the new owner will gain full edit and delete permissions, along with access to any files uploaded by the previous owner. The former owner will lose all access, including read rights.

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I've been working with Microsoft Technologies over the last ten years, mainly focused on creating collaboration and productivity solutions that drive the adoption of Microsoft Modern Workplace.