Microsoft taps Claude to make Copilot Cowork a better agent

How to Use Copilot Cowork with Claude for Long-Running Agentic Tasks in Microsoft 365

TL;DR

• Enable Copilot Cowork in the Microsoft 365 Frontier program (Research Preview available now) to delegate multi-step knowledge work using Anthropic’s Claude technology.
• Describe the desired outcome in natural language; Copilot Cowork automatically pulls context from emails, meetings, files, and data via Work IQ to complete tasks like meeting prep or research summaries.
• Access Claude Sonnet models directly in Copilot Chat across the full M365 experience for better agentic performance on long-running tasks.

Prerequisites

• An active Microsoft 365 Copilot license (E3/E5 or equivalent with Copilot add-on).
• Membership in Microsoft’s Frontier program or early-adopter pilot group.
• Access to the Microsoft 365 admin center with sufficient permissions to enable preview features.
• Familiarity with writing clear, outcome-focused prompts (Claude performs best with specific goals rather than vague instructions).
• A modern web browser and the latest version of Microsoft Teams, Outlook, Word, Excel, and PowerPoint.

Step 1: Enable Copilot Cowork in Your Tenant

Microsoft began rolling out Copilot Cowork as a Research Preview in March 2026 to select Frontier customers, with broader availability expected later in the month through the Frontier program.

1. Sign in to the Microsoft 365 admin center.
2. Navigate to Settings > Org settings > Microsoft 365 Copilot.
3. Look for the Copilot Cowork toggle or the new Frontier Suite preview option.
4. Enable the feature for specific users or security groups. Microsoft recommends starting with a small pilot group of 5–20 knowledge workers.
5. Confirm that Claude Sonnet models are now selectable in Copilot Chat settings.

Once enabled, the Cowork option appears in the Copilot pane across M365 applications.

Step 2: Understand Work IQ – The Context Engine

Copilot Cowork relies on Microsoft’s Work IQ framework, which combines four elements:

• Tenant data: Your organization’s emails, calendars, SharePoint/OneDrive files, and Teams messages.
• Context: Any chat history or files you explicitly provide in the current session.
• Skills: Pre-built instructions and scripts that teach the model how to perform common work patterns.
• Tools: Integration with Microsoft 365 apps (Word, Excel, PowerPoint, Outlook, Teams) so the agent can create, edit, and schedule.

This grounding prevents the model from hallucinating and ensures outputs are based on your actual data.

Step 3: Delegate Your First Task

Here’s how to hand off a real work item right now.

Example: Prepare for a customer meeting

1. Open Microsoft Teams or Outlook and locate the Copilot icon.
2. Click Copilot Cowork (it may appear as a separate tab or agent selector next to standard Copilot).
3. Write a clear outcome-focused prompt:

Prepare me for tomorrow's 10am meeting with Acme Corp. 
Pull the latest emails, meeting notes from the last three calls, and the Q3 proposal from OneDrive. 
Schedule 45 minutes of prep time on my calendar for 2pm today. 
Create a 2-page briefing document, a competitive analysis in Excel, and a 10-slide client-ready deck in PowerPoint. 
Make the deck visually consistent with our brand template.

4. Press Enter and let Cowork begin.

The agent will:

• Search and retrieve relevant context using Work IQ.
• Block time on your calendar.
• Generate the requested deliverables directly in your OneDrive or SharePoint.
• Notify you when the task is complete with links to the outputs.

Example: Research and summarize a market topic

Research the latest funding rounds and product launches in the AI security space over the past 90 days. 
Pull public reports, financial filings, and news articles. 
Deliver a 1-page executive summary, a comparison spreadsheet, and a 5-slide pitch deck for our next investor update.

Step 4: Switch Between Models in Copilot Chat

Microsoft now offers true model diversity in Copilot Chat:

• OpenAI GPT models (default for many tasks).
• Anthropic Claude Sonnet models (newly available across the full Copilot Chat experience).

To switch:

1. Open Copilot Chat in Teams, Word, or the dedicated Copilot app.
2. Click the model selector (usually shown as a dropdown or pill at the top of the chat).
3. Choose Claude Sonnet when you need stronger reasoning for multi-step, long-running work.

Claude’s agentic capabilities, now integrated via Claude Cowork technology, excel at tasks that unfold over time and require multiple tool calls.

Step 5: Review, Approve, and Iterate

Because Cowork runs in a protected, sandboxed cloud environment, all actions are logged and subject to your organization’s Microsoft 365 security and governance controls.

Best practice workflow:

• Receive a completion notification from Cowork.
• Open the generated files (briefing doc, Excel analysis, PowerPoint deck).
• Use Copilot’s “Review with Claude” or “Improve with GPT” options to refine outputs.
• Provide feedback by replying in the Cowork chat thread: “Make the deck more concise and add our latest customer win numbers.”

Tips and Best Practices

• Be specific about outcomes, not steps. Say “Produce a client-ready deck” rather than listing every action.
• Start small. Delegate low-risk, repetitive tasks first (meeting prep, inbox summarization, basic research) before trusting Cowork with high-stakes deliverables.
• Use folders and consistent naming in OneDrive/SharePoint. Cowork finds files more reliably when your data is well-organized.
• Combine models: Use Claude for complex reasoning and planning, then switch to GPT for creative writing or slide design.
• Always review AI-generated content. While code can be tested, presentations and proposals still require human judgment for tone, accuracy, and strategic nuance.
• Monitor compute usage. Long-running agentic tasks consume more tokens; set expectations with your team about when to use Cowork versus standard Copilot.

Common Issues

Why am I getting “Insufficient context” errors?
Cowork relies on Work IQ. Make sure the relevant emails, meetings, and files exist in your Microsoft 365 tenant and are not in personal PST files or external drives. Add explicit context by dragging files into the Copilot window.

The agent scheduled a meeting but didn’t create the deck.
Multi-step tasks sometimes fail partway through. Reply in the same Cowork thread with “Continue from slide creation” or break the task into smaller, sequential requests.

Claude model option is missing in Copilot Chat.
The feature is rolling out gradually. Confirm you are in the Frontier program and that the admin has enabled the preview. Check the Microsoft 365 Message Center for tenant-specific rollout status.

Outputs feel generic or miss key details.
Improve results by providing more context upfront or using follow-up prompts like “Incorporate data from the attached Q4 strategy doc” or “Make this more persuasive for enterprise buyers.”

Security or compliance warnings appear.
Copilot Cowork runs in a sandboxed environment with Microsoft 365’s existing data loss prevention (DLP) and sensitivity labels. If your organization has strict policies, some file access may be blocked. Work with your compliance team to adjust policies for pilot users.

Next Steps

After completing your first few delegated tasks, explore these areas:

• Create reusable “Cowork templates” by saving effective prompts in a Teams channel or OneNote notebook.
• Experiment with cross-app workflows (e.g., start a research task in Teams and have outputs delivered to Excel and PowerPoint).
• Join Microsoft’s Frontier community calls to share prompt patterns with other early users.
• Monitor the official Microsoft 365 Blog for the full Wave 3 release notes and additional agentic scenarios.
• Consider how Cowork fits into your team’s operating rhythm — many organizations are now designating “agent managers” responsible for reviewing AI-generated work.

Copilot Cowork represents Microsoft’s shift from simple assistance to embedded agents capable of long-running knowledge work. By combining Anthropic’s Claude technology with Microsoft 365’s rich context and tool ecosystem, it offers a practical way to delegate tedious research, preparation, and content creation tasks today.

Sources

• Powering Frontier Transformation with Copilot and agents | Microsoft 365 Blog
• Introducing the First Frontier Suite built on Intelligence + Trust - The Official Microsoft Blog
• Microsoft Debuts Copilot Cowork, Bringing Claude Tech Into Office Workflows
• Microsoft debuts Copilot Cowork built with Anthropic's help and E7 software suite | Fortune
• Microsoft taps Anthropic for Copilot Cowork in push for AI agents | Reuters
• Microsoft taps Claude to make Copilot Cowork a better agent