This article explains how to modify the Microsoft 365 Copilot Brand Kit. Because apparently, YES, you DO in fact need an article explaining how to do it!...

Welcome to the September 2026 edition of What's New in Microsoft Copilot!   

Explore what's new for Agent 365 in September 2026.

Claude Opus 5.5 and GPT-6 Sol are joining model choice in Microsoft Copilot.  

Spend less time formatting slides according to your organization’s identity and more time shaping your story with Brand Kit and Skills in Copilot.  

Microsoft 365 Copilot vs Copilot Cowork: Choosing the Right AI for Work As organizations expand their use of AI to improve productivity and automate...

Build full-stack business apps through conversation in Copilot Cowork and Copilot Studio, grounded in enterprise data.

OpenAI's GPT-6 Astra is rolling out in Copilot Cowork and Copilot Studio today   

With millions of users world-wide, Power Apps and Dataverse now sit atop critical business data, but developers face challenges with discoverability and schema understanding. This session introduces Power Apps Model Context Protocol (MCP), which empowers M365 Copilot to access app metadata, Dataverse schemas, relationships, and permissions. Learn how MCP enables Copilot to answer natural-language queries, aggregate data, and deliver real-time insights, plus best practices for Copilot-ready apps. Seating for this session is first-come, first-served. Add it to your schedule to plan your day and arrive early to secure a spot. To learn more, please check out these resources: * https://aka.ms/build26-next-steps 𝗦𝗽𝗲𝗮𝗸𝗲𝗿𝘀: * Christine Flora 𝗦𝗲𝘀𝘀𝗶𝗼𝗻 𝗜𝗻𝗳𝗼𝗿𝗺𝗮𝘁𝗶𝗼𝗻: This is one of many sessions from the Microsoft Build 2026 event. View even more sessions on-demand and learn about Microsoft Build at https://build.microsoft.com DEM360 | English (US) | Agents & apps Demo | (200) Intermediate #MSBuild

Turns out, M365 Copilot's much-vaunted security sandbox isn't quite as robust as we've been led to believe. Some clever sods found a way to make it leak sensitive data.

Now the LegalZoom agent works inside Microsoft 365 Copilot so a legal task no longer means stepping away from your work.