GCC High Priority Update
Week of June 4, 2026
Microsoft 365 Copilot is expanding declarative agent capabilities to GCC High and DoD environments, enabling agents to move beyond question-answering into direct task execution. Using API plugins, MCP tools, and enterprise connectors, declarative agents can invoke external systems, create records, submit requests, and trigger business processes within a single conversational flow. The Copilot platform dynamically reasons over available actions and selects the appropriate tool to fulfill user intent — enabling multi-step workflows without leaving the chat experience. The feature is currently in development and expected to begin rolling out in June 2026.
GCC High M365 Roadmap Updates
Find out what’s coming, what’s going, and what it means for you and your operations. View all Microsoft 365 GCC High roadmap updates for the week of June 4, 2026.
Microsoft 365: Pay-as-you-go storage for OneDrive
New pay-as-you-go, consumption-based meter for additional OneDrive storage. Control which OneDrive accounts can grow beyond their licensed storage limits and give selected users more space as needed.
ID: 562352 Release: OneDrive – Worldwide (Standard Multi-Tenant), GCC, GCC High, DoD Tags: July CY2026
Microsoft Copilot (Microsoft 365): Declarative agents with Actions available in GCC High and DoD
Declarative Agents with Actions enable Microsoft 365 Copilot to take real-world actions by invoking APIs, plugins, and enterprise workflows directly within the chat experience. Using custom actions, declarative agents can call external systems, execute operations, and retrieve or update data, moving beyond Q&A to full task completion. These actions are powered through API plugins, MCP tools, and enterprise connectors, allowing seamless integration with line-of-business applications and services. The Copilot platform dynamically reasons over available actions and selects the appropriate tool to fulfill user intent, enabling multi-step workflows such as creating records, submitting requests, or triggering business processes within a single conversational flow
ID: 564606 Release: Microsoft Copilot (Microsoft 365) – GCC High, DoD Tags: June CY2026
Microsoft Copilot (Microsoft 365): MCP-Based Agent Enablement for U.S. Government Clouds
We’re introducing support for Model Context Protocol (MCP)-based agents in Microsoft 365 Copilot . This update enables developers to build Copilot agents using MCP servers and allows users to interact with these agents using familiar experiences. This change supports extensibility and improves agent capabilities for organizations.
ID: 564607 Release: Microsoft Copilot (Microsoft 365) – GCC, GCC High, DoD Tags: June CY2026
Microsoft Copilot (Microsoft 365): Support for MCP Agents with Interactive UI Widgets in Government Clouds
Feature description: Model Context Protocol (MCP) based agents in Microsoft 365 Copilot Chat will now be able to surface rich, interactive UI widgets directly within chat. This enhancement enables developers to deliver more engaging and structured agent interactions. Users will experience these widgets when interacting with agents that implement them, and admins will continue to manage these agents through the Microsoft 365 Admin Center.
ID: 564608 Release: Microsoft Copilot (Microsoft 365) – GCC, GCC High, DoD Tags: June CY2026
Outlook: Variable number of message preview lines
Outlook for Windows and Outlook for Web will now allow users to modify how the preview text for emails show in the message list. The preview text can now take up 2 lines, 1 whole line, or 0 additional lines.
ID: 564610 Release: Outlook – Worldwide (Standard Multi-Tenant), GCC, GCC High, DoD Tags: June CY2026
Outlook: Sort improvements to the message list
When sorting on Outlook for Web or Outlook for Windows, if the Sort By field is not one of From, Subject, or Date Received, we will now show an additional column for the Sort By value (e.g., Size). We will also support sorting by Flag Due Date.
ID: 564803 Release: Outlook – Worldwide (Standard Multi-Tenant), GCC, GCC High, DoD Tags: June CY2026
Microsoft Teams: Sharing recap access
Recording and transcript owners can now grant recording and transcript access to specified people when copying or sharing recap link, and the specified people can access the recap without having to request access.
ID: 559606 Release: Microsoft Teams, Microsoft Copilot (Microsoft 365) – Worldwide (Standard Multi-Tenant), GCC, GCC High Tags: May CY2026