Microsoft has decided to discontinue the COPILOT function in Excel, which was never widely available and was accessible only to Frontier and Insider users since August 2025. The feature allowed users to interact with spreadsheets using natural language for tasks like summarizing text and categorizing feedback, and it could retrieve information from the web. Users will no longer be able to create new formulas using the COPILOT function after September 14, 2026. While the COPILOT function will be discontinued, similar functionalities will still be available through the Copilot side pane, which supports various AI-driven tasks. Microsoft is shifting towards a more unified Copilot experience within its Microsoft 365 suite, indicating a strategic reassessment of its Copilot offerings.