Microsoft announced Copilot Cowork on March 9, a new feature that uses Anthropic's Claude model and agentic framework to execute multistep tasks across Microsoft 365 applications. The product represents the most visible integration yet from the companies' $30 billion Azure compute agreement struck in November 2025.
Copilot Cowork handles long-running workflows through a single request: assembling presentations, pulling financials, scheduling meetings. It runs in the cloud within a customer's Microsoft 365 tenant, integrated with what Microsoft calls Work IQ, an intelligence layer drawn from a user's emails, files, meetings, and chats.
The feature uses the same agentic harness as Anthropic's own Claude Cowork product, which launched in January and runs locally on a user's device. Jared Spataro, Microsoft's chief marketing officer for AI at Work, said the cloud-based approach is deliberate. Anthropic's offering, he said, has "limitations" in a corporate environment, citing the absence of cloud-based enterprise data access and security concerns at scale.
Copilot Cowork is one component of what Microsoft is calling Wave 3 of Microsoft 365 Copilot. The company also introduced Agent 365, a management platform for AI agents priced at $15 per user per month, with general availability on May 1. In two months of preview, tens of millions of agents appeared in the Agent 365 registry. Microsoft said it now has visibility into more than 500,000 agents internally.
A new Microsoft 365 E7 licensing tier, also available May 1, bundles E5, Copilot, Agent 365, and advanced security tools at $99 per user per month. The component pricing of the individual products totals $117. Judson Althoff, CEO of Microsoft's commercial business, said customers indicated that E5 alone is no longer sufficient.
The announcement marks a shift in Microsoft's model strategy. Copilot was originally built on OpenAI's models, a partnership backed by $13 billion in Microsoft investment beginning in 2019. The relationship has since expanded to include Anthropic, which committed to spend $30 billion on Azure compute last November. Microsoft and Nvidia invested up to $5 billion and $10 billion respectively in Anthropic as part of that agreement.
"Every 60 days at least, there's a new king of the hill," Spataro said. Microsoft 365 Copilot is now described as model-diverse by design.
Microsoft's shares have fallen more than 14 percent since Anthropic debuted Claude Cowork in January. Copilot adoption, while growing, remains a fraction of the company's commercial installed base. Fifteen million paid Copilot seats, reported in January, represent 3.3 percent of Microsoft's 450 million commercial users. Seat growth has been 160 percent year over year, with daily active usage up tenfold.
Not all observers are persuaded the integration will sustain momentum. Ethan Mollick, a Wharton professor who studies AI adoption, questioned whether Microsoft would keep the product current. Anthropic's standalone Cowork product, Mollick noted, was built in weeks and is evolving at a pace Microsoft has historically not matched.
Copilot Cowork is available in limited research preview. Broader access through Microsoft's Frontier program is expected later in March.
