Microsoft Copilot is an AI assistant deeply integrated across the Microsoft 365 ecosystem, including Word, Excel, PowerPoint, Outlook, Teams, and Windows. Powered by OpenAI's GPT-4o and other frontier models, Copilot transforms productivity workflows by enabling natural language document drafting, data analysis, presentation creation, email summarization, and meeting recaps directly within familiar Microsoft apps. In 2026, Copilot introduced Agent mode, which expands its capabilities from simple drafting to guided multi-step editing across Word, Excel, and PowerPoint. Users can prompt Copilot on a blank document to get started, and Edit with Copilot automatically activates in Word for a continuous AI-assisted flow. New features include customizable meeting recap templates (Speaker Summary, Executive Summary, or custom formats), SharePoint list and site grounding for contextual enterprise responses, and voice input support across mobile and desktop apps. The enterprise tier includes Copilot Cowork, developed in partnership with Anthropic, for handling complex multi-step tasks such as scheduling emails and preparing meeting documents. Microsoft Copilot is available as a free tier with basic conversational AI, integrated into Microsoft 365 Personal, Family, and Premium subscriptions for individuals, and offered as business and enterprise add-ons for organizations. With the upcoming Microsoft 365 E7 bundle at $99 per user per month, Copilot is positioned as a core enterprise AI layer rather than a standalone add-on.