Microsoft 365 Service Updates for October 20 - 26, 2025

Microsoft 365 service updates scheduled primarily between late 2025 and mid-2026, detailing changes across various platforms. Key updates include a focus on unified app management and app-centric policies within Microsoft Teams, alongside significant retirements such as the phasing out of SharePoint Alerts and the impending block of Exchange Web Services (EWS) in favor of Microsoft Graph. Several enhancements involve artificial intelligence, such as the introduction of Copilot in Classic Outlook for enhanced search summaries and the Knowledge Agent preview in SharePoint for content optimization. Furthermore, the updates cover various user experience improvements in SharePoint, Outlook, and Teams, as well as crucial action items for administrators regarding security, domain setup, and browser policy configuration.