Quick answer: The May 2026 edition of Microsoft 365 Copilot introduces two new AI models (Claude Opus 4.8 and GPT-5.5 Instant), federated connectors that pull live data from external tools via the Model Context Protocol, a redesigned chat-centred app, and fresh skills across Excel, PowerPoint, Teams, Word and more. Many features roll out from May, with broader availability in June.
Microsoft keeps a steady cadence with its Copilot releases, and the May 2026 update is one of the more substantial drops this year. Published on 29 May 2026, the “What’s New in Microsoft 365 Copilot” edition spans new AI models, app redesigns, smarter project workspaces, and a fresh wave of governance controls for IT teams.
If you use Microsoft 365 every day, manage it for your organisation, or simply like staying ahead of the curve, this roundup breaks down what actually changed—and what’s worth trying first. A quick note before we dive in: Microsoft states that the dates mentioned in its release notes are tentative and subject to change, so availability may shift slightly depending on your tenant.
Let’s get into it.
Microsoft Officially: What’s New in Microsoft 365 Copilot | May 2026
What is Microsoft 365 Copilot, and who is this update for?
Microsoft 365 Copilot is the AI assistant built into apps like Word, Excel, PowerPoint, Outlook and Teams. It helps you draft documents, analyse data, summarise meetings and automate repetitive tasks—all grounded in your work content when paired with Work IQ.
This update matters most to three groups:
- Everyday M365 users who want faster ways to write, present and stay on top of email.
- IT admins responsible for rolling out features safely and governing data access.
- Power users who push Copilot into more advanced, multi-step workflows.
Microsoft organises the release into two buckets: user capabilities and Copilot controls (the admin-facing settings). We’ll cover both.
Which new AI models are available in Microsoft 365 Copilot?
Microsoft expanded its model lineup this month, giving you more choice depending on the task in front of you.
Claude Opus 4.8
Anthropic’s Claude Opus 4.8 is now available in Microsoft 365 Copilot, expanding model choice for more advanced work scenarios. According to Microsoft, the model supports complex, multi-step tasks and long-running workflows, with improvements in tool selection, instruction following, and task completion.
It tends to perform especially well for drafting documents, analysing data, and building presentations. Claude Opus 4.8 is available in Copilot Cowork (Frontier) and is rolling out to Copilot Studio early release cycle environments, Copilot Chat, Excel, and PowerPoint for licensed users. When used with Work IQ, outputs are grounded in your organisation’s data for more relevant and accurate results.
GPT-5.5 Instant
OpenAI’s GPT-5.5 Instant arrives in both Microsoft 365 Copilot and Microsoft Copilot Studio. It brings higher-quality responses for everyday work tasks, image analysis, and STEM-related questions. Building on GPT-5.3 Instant, it delivers clearer, more concise answers with less verbosity and fewer unnecessary follow-up questions.
You’ll see it labelled as “GPT-5.5 Quick response” in Copilot Chat and “GPT-5.5 Chat” in Copilot Studio early release cycle environments. GPT-5.5 Instant rolled out in May.
Choose Claude Opus 4.8 if your work involves long, multi-step projects like building a deck from scratch. Choose GPT-5.5 Instant if you want quick, concise answers for day-to-day tasks.
What are federated Copilot connectors, and why do they matter?
This is arguably the most strategic release of the month. Federated Copilot connectors are now available to bring real-time enterprise data into Copilot through the Model Context Protocol (MCP).
In plain terms, Copilot can now query external tools live, at the moment you ask—rather than relying on older, cached snapshots of your data. You can connect live data from hundreds of SaaS systems into Work IQ while maintaining native security controls.
The first wave of connectors includes LSEG, Moody’s, HubSpot, and Notion. These are available in Copilot Chat and Researcher, with LSEG and Moody’s also accessible in Excel. Organisations can also build custom federated connectors for their own internal systems. This feature rolled out in May.
For teams juggling a sprawling tool stack, this is a genuine time-saver: ask one question, and Copilot can fetch the latest information from across your connected services. Admins will want to review which connectors to enable and how data access is governed before switching things on broadly.
What changed in the redesigned Copilot app?
The Microsoft 365 Copilot app received a visual refresh. The new design delivers a more streamlined, chat-centred experience—simplifying the chat and response layout and improving navigation. This redesign is rolling out in June.
Copilot also arrived in Apple CarPlay in May, letting you use hands-free voice to start a new conversation or continue an existing chat while driving.
How have Copilot Notebooks been upgraded?
Copilot Notebooks are becoming a proper home for project work. The updated design organises chats and work by project, bringing chats, output creations, and references together in one place. This rolls out in June.
Here’s what else is new:
- OneNote sync: Copilot Notebooks in the Microsoft 365 Copilot app and in OneNote now stay in sync.
- Teams meetings as knowledge sources: You can bring transcripts, notes, chats, and shared content into the Notebooks experience (Frontier in May, worldwide in June).
- Excel generation: Generate spreadsheets via the Excel agent, which asks clarification questions to refine the output (Frontier in May, worldwide in June).
- Infographics: Automatically convert notebook content into clear, visual summaries (Frontier in May, worldwide in June).
What are the new PowerPoint one-click skills?
PowerPoint gained one-click skills that cut out the need for long prompts. Instead of describing what you want, you pick a skill and let Copilot act on your deck. These rolled out in May:
- Review this presentation: Offers slide-by-slide suggestions to improve structure, clarity, and storytelling.
- Visualise this slide: Transforms text-heavy slides into engaging visuals.
- Prepare for Questions: Helps you understand a presentation’s weak points and anticipate audience questions.
There’s also Slide explanations in PowerPoint Live, where attendees can select slide text during a meeting and ask Copilot to explain the content. This rolls out in June.
What’s new in Microsoft Teams?
Teams is getting smarter about meetings and calls.
- Copilot call delegation: When you can’t pick up a Teams Phone call, Copilot answers on your behalf, captures intent and details, and delivers a summary. It can also set up follow-ups via Microsoft Bookings (Frontier in June).
- Permanent deletion: You can now permanently delete recordings, transcripts, AI summaries, and notes via the More (…) menu (rolled out in May).
- Video recap: Copilot turns recorded Teams meetings into short, narrated highlight reels (rolled out in April).
What did Word, Outlook and SharePoint get?
These quieter updates carry real day-to-day impact across the rest of the suite.
Word (rolled out in May) added a consolidated summary of recent file activity in the Copilot chat pane, Copilot memory for more personalised responses, personalised insights at the top of your document, and Word Agent writing suggestions on the web.
Outlook introduced an account selector—a dropdown in the Copilot side pane for people managing multiple accounts (rolled out in May).
SharePoint added custom skills, letting you turn repeatable, multi-step workflows into reusable, site-specific assets (rolled out in May).
What new controls do IT admins get?
Governance kept pace with the feature releases this month:
- ISO/IEC 42001:2023 certification expansion: Microsoft describes this as the broadest ISO 42001 coverage achieved by any AI company to date, now extended to Copilot Studio, GitHub Copilot, Dragon Copilot, and Copilot Health.
- Copilot Adoption Hub: A resource for deployment leads to help drive rollout.
- Watermark content in Teams meetings: Generally available since March, with GCC-High in May and DoD in June.
What should you try first?
If you only have time to explore a few features, start here:
- Federated Copilot connectors — If your team relies on tools like HubSpot or Notion, connecting them gives you live answers from across your stack in a single prompt.
- PowerPoint one-click skills — “Review this presentation” and “Prepare for Questions” are quick wins for anyone who presents regularly.
- Copilot Notebooks — Worth setting up if you manage ongoing projects and want chats, files and outputs in one place.
For IT admins, the priority is governance. Review the new federated connectors carefully, decide which to enable, and confirm how data access aligns with your security policies. The expanded ISO/IEC 42001 certification is also useful evidence when building the compliance case for wider Copilot adoption.
The bigger picture? Microsoft is steadily turning Copilot from a helpful assistant into a connected workspace that reaches across your tools and projects. The features that look like small conveniences today—live connectors, project notebooks, one-click skills—are the foundation of how work gets done tomorrow.
For the full list of features and exact rollout dates, check the official Microsoft “What’s New in Microsoft 365 Copilot – May 2026” recap. And if you’d like a digestible breakdown like this one every month, follow thelalitblogs.com for our regular Copilot roundups.
Frequently asked questions
When did the Microsoft 365 Copilot May 2026 update release?
The May 2026 edition of “What’s New in Microsoft 365 Copilot” was published on 29 May 2026. Many features rolled out during May, while several—including the redesigned app and Copilot Notebooks updates—are scheduled for wider release in June. Microsoft notes that all dates are tentative and subject to change.
Which AI models are now available in Microsoft 365 Copilot?
Two new models arrived this month: Anthropic’s Claude Opus 4.8 and OpenAI’s GPT-5.5 Instant. Claude Opus 4.8 suits complex, multi-step work, while GPT-5.5 Instant delivers faster, more concise answers for everyday tasks.
What are federated Copilot connectors?
Federated Copilot connectors let Microsoft 365 Copilot query external tools live through the Model Context Protocol (MCP), pulling real-time data instead of cached snapshots. The first wave covers LSEG, Moody’s, HubSpot and Notion, with organisations able to build custom connectors for internal systems.
Do I need to do anything as an IT admin?
Yes. Before enabling features broadly, review the new federated connectors and confirm how they handle data access under your security policies. The expanded ISO/IEC 42001:2023 certification and the new Copilot Adoption Hub can support both your governance and rollout planning.
Where can I find the full list of May 2026 updates?
The complete feature list and exact rollout dates are available in Microsoft’s official “What’s New in Microsoft 365 Copilot – May 2026” post on the Microsoft Tech Community blog.
