Microsoft has launched Copilot Cowork through its Frontier Program, bringing Anthropic Claude integration for long-running multi-step tasks, an upgraded Researcher agent, and a new AI Critique feature.

Microsoft Copilot bypassed DLP policies and sensitivity labels twice in eight months — including a four-week exposure affecting the UK's NHS — revealing a systemic blind spot in enterprise AI security stacks.

Microsoft confirms a critical bug allowed Copilot AI to summarize confidential emails since January, bypassing data loss prevention policies in Microsoft 365.