This collection of Microsoft 365 Service Updates details a wide array of upcoming technical changes, feature retirements, and platform enhancements scheduled through 2026. Significant infrastructure shifts include the end of support for SharePoint Designer 2013, mandatory browser upgrades for Teams on the web, and essential certificate renewals for Windows Secure Boot. The documents also highlight the integration of AI-powered Copilot agents into Office applications and the modernization of user interfaces within SharePoint and Teams. Administrators are notified of several feature removals, such as Context IQ and specific legacy reporting tools, to streamline the ecosystem. Furthermore, the updates outline new security measures for Microsoft Defender and introduce a paid Extended Service Term for subscription management. Consistent throughout these reports is a focus on automated rollouts and the necessity for IT departments to update internal documentation.