On March 16, 2023, Microsoft introduced Microsoft 365 Copilot, embedding a large-language-model assistant directly into Word, Excel, PowerPoint, Outlook, Teams, and the Power Platform. CEO Satya Nadella framed it as “the next major step in the evolution of how we interact with computing,” with natural language as the universal interface to office software.
The distinguishing design was grounding. Rather than answering from the model’s general training alone, Copilot combined the LLM with a customer’s own content through Microsoft Graph - their calendar, emails, chats, documents, meetings, and contacts - so it could draft a document from a prior file, summarize a meeting thread, or build a deck from a Word doc. Microsoft also announced Business Chat, an experience that worked across the model, the apps, and the user’s data at once. The company stressed that “Copilot LLMs are not trained on your tenant data or your prompts,” an attempt to address the enterprise data-governance worries that gated adoption.
Coming two days after GPT-4 and the same week as Khanmigo and Duolingo Max, the announcement signaled that the biggest software vendors intended to retrofit generative AI into the tools businesses already paid for.
Why business readers should care: Microsoft 365 Copilot is the flagship case of “grounded” enterprise AI - the value comes less from the raw model than from securely connecting it to a company’s existing documents and permissions so its output is relevant and the data stays governed.