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Frequently Asked Questions (FAQ)

This is likely "context truncation." The chat history is part of the context window, and as the conversation gets longer, earlier messages are pushed out to make room for new prompts and retrieved data. Start a new chat to reset the window with a fresh focus.


Use the in-app Copilot (e.g., in Word) with the document open. In M365 Chat, be explicit with your grounding: "Using only the document /path/to/Policy_v4.docx, answer the following..." This scopes the retrieval and prevents Copilot from searching your wider tenant.

The "context window" is the session's "working memory," which resets after the chat ends. Microsoft is also rolling out a "Memory" feature that allows Copilot to learn your preferences (e.g., writing style, common collaborators) persistently. This persistent memory helps shape future prompts but is separate from the token limit of a single conversation.

Microsoft does not publish a specific token number for M365 Copilot, as this changes with the underlying models. Instead, it provides practical guidance (as of Oct 2025): Copilot can retrieve from documents up to ~1.5 million words for summarisation, can rewrite ~3,000-word passages, and can ground a single M365 Chat prompt against ~20 relevant files.

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