Microsoft's Copilot AI assistant has reached a milestone of 100 million active enterprise users, making it the fastest-growing product in the company's history. The tool, which integrates with Office applications, Windows, and business systems, has fundamentally changed how knowledge workers operate.

Early adopter companies report productivity gains of 25-40% for tasks like writing, data analysis, and meeting preparation. Microsoft charges $30 per user per month for the full Copilot experience, generating an estimated $36 billion in annual recurring revenue.

"Copilot represents the biggest shift in productivity tools since the spreadsheet," said Microsoft CEO Satya Nadella.