When you use Microsoft 365 Copilot, particularly under the umbrella of commercial data protection, user prompts and AI-generated responses are not retained by Microsoft. If you start a temporary chat and then initiate a new chat (or close the browser), the previous session's context, prompts, and responses are deleted immediately from the system's short-term memory. They are not saved to OneDrive, moved to a notebook, or cached for an hour. This behavior enforces Microsoft's strict privacy commitments ensuring that commercial data is not saved, Microsoft has no "eyes-on" access to your chat history, and your session data is never used to train the underlying foundational Large Language Models (LLMs).

Microsoft Learn - Official Documentation: Data, Privacy, and Security for Microsoft Copilot for Microsoft 365. Section: "How Copilot protects organizational data." This document specifies that prompts and responses are not retained or stored after a session is cleared or closed.

Microsoft Learn - Official Documentation: Microsoft Copilot Privacy and Protections. Section: "Commercial Data Protection." Explicitly outlines that when a user ends a chat session, the chat data is discarded immediately to ensure enterprise security and privacy standards.