Microsoft reports 15 million paid Microsoft 365 Copilot seats out of 450 million total commercial seats, but fewer than 4 in 10 employees with Copilot access actively use it. Seventy percent of Fortune 500 companies have adopted Microsoft 365 Copilot, but for most adoption means pilots and phased rollouts, rather than enterprise-wide deployment. The platform integrates into Word, Excel, PowerPoint, Outlook, and Teams with enterprise-grade security and compliance—no duplication, just personalized, context-aware results. But production pushes the limits. In September 2025, a tweet noting that Copilot in Excel fails at simple math went viral. A small business teaching copilot reported failure of over 25 scheduled prompts over the past four days. Nearly half of IT leaders say they lack confidence in their ability to manage Copilot's security and access risks. Many users, even within companies that have made the investment, are continuing to opt for ChatGPT over Microsoft's integrated AI assistant.