New Microsoft 365 Copilot Features to Explore in 2026

Summary

The start of 2026 brings a meaningful set of new Microsoft 365 Copilot capabilities rolling out across the platform. Copilot Pages reaches general availability, Graph-grounded responses become significantly more accurate, multi-agent orchestration moves from preview to production-ready, and Copilot in Outlook gains powerful new abilities. This post looks at what is new from a developer’s perspective: what these features mean, how they work under the hood, and where the extensibility opportunities lie.

1. Copilot Pages: General Availability

Copilot Pages — the collaborative, AI-generated documents that live in Loop — reached general availability in January 2026. Pages are editable, shareable documents generated by Copilot in response to complex prompts, and they persist in the user’s Loop workspace.

What this means for developers

Pages are stored in Microsoft Loop, which means they are accessible through the Microsoft Graph Fluid Framework API.
You can programmatically read Page content via the Graph driveItem endpoint on the user’s Loop storage:

GET https://graph.microsoft.com/v1.0/me/drive/root:/Copilot Pages:/children

Pages can be referenced as context in subsequent Copilot prompts, enabling multi-turn research workflows.
Organisations can apply sensitivity labels to Pages via the existing Information Protection APIs.

Extensibility opportunity

If you are building a declarative agent, you can now instruct it to save structured outputs as a Copilot Page:

  
{
  "instructions": "When the user asks for a project summary, generate a structured summary and offer to save it as a Copilot Page in their Loop workspace."
}

2. Improved Graph-Grounded Responses

Microsoft has made significant improvements to how Copilot retrieves and reasons over content from Microsoft Graph (SharePoint, Teams, Exchange, OneDrive). The key improvements in 2026:

Semantic chunking

Copilot now uses semantic chunking for document retrieval rather than fixed-size chunks. This means a 50-page contract will be split at natural section boundaries (headings, clause numbers) rather than arbitrary token counts, dramatically improving the quality of answers about specific clauses.

Cross-document reasoning

Copilot can now synthesise information across up to 20 documents in a single response (up from 5 in 2025). For developers building declarative agents with SharePoint knowledge sources, this means broader queries — like “Summarise the key risks mentioned in all Q4 project reports” — now work reliably.

Citation improvements

Citations in Copilot responses now include:

The document section or page number where the information was found.
A confidence indicator (high/medium/low) surfaced through the response metadata.
Deep links into SharePoint documents that open at the specific page.

3. Multi-Agent Orchestration (Production-Ready)

Multi-agent orchestration — where a primary Copilot agent delegates tasks to specialised sub-agents — moved out of preview in January 2026.

How it works

The orchestration layer uses an intent routing model to determine which registered agent is best suited to handle a given message or sub-task. Developers register agents with capability descriptions, and the orchestrator matches user intent to the most appropriate agent.

  
{
  "agents": [
    {
      "id": "hr-agent",
      "displayName": "HR Assistant",
      "description": "Handles questions about leave, policies, benefits, and onboarding.",
      "endpoint": "https://contoso.com/agents/hr"
    },
    {
      "id": "it-agent",
      "displayName": "IT Helpdesk",
      "description": "Handles software requests, account issues, and hardware support.",
      "endpoint": "https://contoso.com/agents/it"
    }
  ]
}

Developer implications

Agent-to-agent handoff — an agent can explicitly transfer context to another agent mid-conversation using the new handoff payload in the agent response schema.
Shared conversation context — the orchestrator maintains a context window shared across all participating agents, so the IT agent can reference a previous answer given by the HR agent.
Billing is per-agent-turn — each sub-agent invocation consumes Copilot capacity. Design orchestration flows carefully to avoid unnecessary hops.

4. Copilot in Outlook: New Features

Meeting preparation briefs (enhanced)

Copilot in Outlook now generates pre-meeting briefings that include:

Recent emails and Teams messages with the meeting attendees.
Related documents shared in those conversations.
Open action items from previous meetings with the same attendees.

Email coaching

Copilot can now coach you on a draft email before you send it, flagging:

Tone mismatches (e.g., overly casual to a senior executive).
Missing context or unclear asks.
Potential misunderstandings based on prior email history with the recipient.

For developers: Copilot in Outlook add-ins

The new Office Add-in Copilot extensibility points allow Office.js add-ins to:

Surface custom contextual suggestions alongside Copilot’s native Outlook suggestions.
Register custom coaching rules via the new CopilotCoachingExtension manifest entry.

  
{
  "extensions": [
    {
      "type": "CopilotCoachingExtension",
      "id": "contoso-compliance-coach",
      "displayName": "Compliance Tone Coach",
      "description": "Flags language that may conflict with Contoso's communication policy.",
      "runtimeUrl": "https://contoso.com/copilot/coaching"
    }
  ]
}

5. Developer Experience Improvements

Copilot Studio: Agent Analytics Dashboard

Copilot Studio now includes a built-in analytics dashboard showing:

Topic trigger frequency and drop-off rates.
Escalation rates per topic.
Unrecognised utterances (phrases that did not match any topic).
User satisfaction scores (via end-of-conversation surveys).

This is invaluable for iterating on agent quality. Accessible under Analytics in the Copilot Studio left navigation.

Teams AI Library v2.1

The Teams AI Library v2.1 patch adds:

ActionPlanner improvements for more reliable multi-step task execution.
A FeedbackLoop component for collecting thumbs up/down feedback on bot responses.
TypeScript strict mode compatibility ("strict": true in tsconfig now supported).

Conclusion

2026 starts strong for M365 Copilot. The GA of Copilot Pages, the jump to 20-document cross-reasoning, and production-ready multi-agent orchestration all represent meaningful leaps in what Copilot can do and how developers can extend it. Prioritise understanding the multi-agent orchestration model if you are building enterprise Copilot solutions — it will be the dominant architectural pattern for complex M365 AI solutions throughout 2026.