There are many security and governance challenges associated with deploying Microsoft Copilot, including risks like data oversharing, prompt injection, permission misuse, AI hallucinations and third‑party plugin exposure. This resource walks through a Copilot‑specific threat model, secure deployment architecture, and a phased approach covering assessment, remediation, deployment, and continuous monitoring. It also shows how Zero Trust principles and NIST and CISA frameworks can be applied to support secure, compliant AI adoption in agency environments.