05/08/2026
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When you roll out Microsoft 365 Copilot, you’re handing every employee a large language model that grounds its responses in the documents, emails, chats, and meeting notes already sitting in your tenant.That’s the value proposition — Copilot doesn’t make things up out of nothing, it answers from your data. The trouble is, your data isn’t a clean source of truth. It’s an archaeological site. Most tenants we scan have content from three different eras of the business: the founding-team docs from 2017 that nobody has touched in five years, the "transformation initiative" content from 2021 that everyone still references even though it was deprecated, and the current quarter’s working files.Copilot doesn’t know which era to trust. It looks at all of them, weighs by recency and relevance scores, and gives you an answer that’s plausibly drawn from any of them — sometimes blending facts that contradict each other. That’s a hallucination.
Microsoft 365 Copilot grounds every answer in your tenant’s own content. When that content is stale, contradictory, or duplicated, Copilot doesn’t shrug — it answers with confidence. Here’s why that’s a problem and what to do about it.