Microsoft Copilot
Microsoft's umbrella brand for AI assistants — separate from GitHub Copilot. Primarily driven by OpenAI models via Azure.
Rebranded "Bing Chat" 2023 → Microsoft Copilot. Integrated into: Windows 11 (Copilot key on the keyboard 2024), Office 365 (Copilot for Word/Excel/PowerPoint, $30/month), Edge sidebar, Outlook, Teams. Copilot Studio lets companies build their own agents. Confusingly many "Copilots" (GitHub Copilot is a different product). Microsoft has invested $13B+ in OpenAI for Azure exclusivity.