Microsoft 365 Copilot is enterprise AI built directly into the Office apps where knowledge workers already spend their days. In Word it drafts, rewrites, and summarizes. In Excel it generates formulas, creates charts, and analyses data through natural language. In PowerPoint it builds presentations from prompts. In Outlook it summarizes email threads and drafts responses. In Teams it transcribes meetings and generates action items. The integration depth is the key value - you don't switch to an AI tool, the AI is already in the tool you're using. For large organizations already standardized on Microsoft 365, the productivity gain potential is significant. At $30/user/mo on top of existing Microsoft 365 licenses, it's priced at enterprise budgets. The value calculation depends heavily on how intensively your team uses Office apps.