Something Big Just Happened

On March 9, 2026, Microsoft announced Wave 3 of Microsoft 365 Copilot. The headline feature is Copilot Cowork — a cloud-based AI agent that can execute multi-step tasks across your Microsoft 365 environment on your behalf. And the engine powering it is Anthropic's Claude.

This is not a minor update. It is a fundamental shift in what Microsoft 365 can do. And if you run a business on M365 — which most mid-sized organisations do — you need to understand what this means before your competitors figure it out.

What Exactly Is Copilot Cowork?

Until now, Copilot in Microsoft 365 was reactive. You prompted it, it responded, and you moved on. Cowork changes the architecture entirely. Instead of answering a single question, Cowork can manage a workflow that spans multiple Microsoft 365 applications over an extended period — without you manually coordinating each step.

Microsoft's Jared Spataro described the shift plainly: Copilot is going "from assistance to real doing." That framing matters. This is not a smarter chatbot. It is an agent that acts.

Here is what Cowork can do in practice. You brief it on a goal — say, preparing a competitive analysis briefing for a board meeting. Cowork can pull relevant emails and Teams threads from the past month, find the relevant SharePoint documents, summarise the key points using Claude's reasoning, draft a PowerPoint presentation in your organisation's brand template, and post the draft to the relevant Teams channel with a summary — all without you switching between applications or chaining prompts together.

Why Claude? And Why Does That Matter?

Microsoft built Copilot Cowork in close collaboration with Anthropic, using Claude as the reasoning engine and the same agentic harness that powers Anthropic's own Claude Cowork product. The decision to use Claude reflects Microsoft's deliberate move away from a single-model dependency. Microsoft 365 Copilot is now model-diverse by design — customers can choose Claude or OpenAI models depending on the task.

Claude brings specific strengths to Cowork: long-context reasoning (Claude Opus 4.6 supports a one-million-token context window), strong performance on complex multi-document synthesis, and reliable instruction-following in agentic workflows. For enterprise tasks that involve reading large volumes of documents and producing structured outputs, these capabilities translate directly into better results.

The deeper point is that Microsoft is betting on model choice as a competitive advantage. Rather than locking customers into a single AI provider, they are building a platform where the best model for each job can be selected. That is a significant shift from where things stood eighteen months ago.

How Is Copilot Cowork Different from Anthropic's Claude Cowork?

Anthropic released Claude Cowork for Mac in January 2026 and for Windows in February. It is a powerful desktop agent that operates on your local files and connects to external services through MCP connectors. But it is fundamentally a personal, device-level tool.

Copilot Cowork operates in the cloud, inside your Microsoft 365 tenant. That difference is significant for enterprise use in several ways. First, it has access to your entire M365 data graph — emails, calendars, Teams conversations, SharePoint documents, and more — not just your local files. Second, it operates within your organisation's existing security, compliance, and governance controls. Third, every action it takes is logged and auditable through Microsoft's Agent 365 governance platform.

Spataro was direct about this distinction: Copilot Cowork "actually doesn't work locally, and that's a feature, not a bug."

What Does This Mean for Your Business Right Now?

Copilot Cowork is currently in Research Preview with a limited set of customers, with broader access through Microsoft's Frontier program expected in late March 2026. It requires a Microsoft 365 Copilot license at $30 per user per month on top of existing enterprise subscriptions.

That pricing positions it as a deliberate investment rather than a default inclusion. The question for business leaders is not whether to pay attention — it is how quickly to start evaluating it for the workflows that would benefit most.

The workflows most immediately suited to Cowork are ones that currently require a person to coordinate across multiple M365 applications: report compilation, meeting follow-up sequences, cross-department data gathering, proposal drafting from multiple source documents, and onboarding workflows that span HR, IT, and management touchpoints.

At Trim Journey, we help organisations map exactly these kinds of workflows and build the agent configurations that make Cowork and Copilot Studio deliver measurable results. Book a 30-minute call to find out where Copilot Cowork can make the biggest difference in your business.