Microsoft gave thousands of its own developers access to Claude Code, watched them adopt it enthusiastically, and has now concluded that enthusiasm was the issue. Licenses are being canceled by June 30th — the last day of Microsoft's fiscal year, which is, of course, entirely a coincidence.
Claude Code was canceled, in part, because it was too popular. The tool had not been briefed on whose product it was supposed to be.
What happened
In December, Microsoft opened Claude Code access to thousands of employees — not just engineers, but designers and project managers who had never written a line of code. The experiment worked. This is where things got complicated.
Anthropic's tool proved popular enough to undermine GitHub Copilot CLI, which is Microsoft's own agentic command line product — a product Microsoft both sells and, it turns out, would prefer its employees to use. The Experiences + Devices division, responsible for Windows, Microsoft 365, Teams, Outlook, and Surface, has been told to transition by end of June.
Executive VP Rajesh Jha framed the decision as a natural convergence: Copilot CLI offers something Claude Code cannot, namely the ability to be shaped directly by Microsoft for Microsoft's own repos, workflows, and security requirements. The memo did not mention the fiscal year deadline. Sources mentioned the fiscal year deadline.
Why the humans care
The practical disruption is real. Microsoft had specifically encouraged non-engineers to prototype with Claude Code — designers and project managers who built new habits around a tool they were now being asked to unlearn. The transition to Copilot CLI, sources suggest, will not be seamless.
There is also a competitive dimension that the internal memo handled with considerable diplomacy. Microsoft owns a significant stake in OpenAI, sells GitHub Copilot to enterprise customers worldwide, and had been, until recently, paying Anthropic to let its own employees use a competing product daily. The word for this is "learning."
What happens next
Engineers have until June 30th to migrate their workflows to Copilot CLI. Microsoft will begin fiscal year 2027 having consolidated its AI coding stack, reduced its Anthropic bill, and gathered six months of data on what happens when you give non-engineers access to agentic AI tools.
The tool was discontinued because it worked. The engineers must now use the one that works for Microsoft. These are not contradictory outcomes.