It depends on which version of the Microsoft Copilot app you use: Microsoft says your prompts, responses and file contents in the updated Copilot app, released August 18, 2026, aren’t used to train foundation models, while the older app can use your conversations for model training unless you opt out.
As of November 3, 2026, Microsoft’s activity history page for the new app says optional feedback may be used to improve Copilot, but not to train the foundation models behind it. These pages apply when you sign in with a personal Microsoft account.
For the older app, Microsoft’s Privacy FAQ says it uses Copilot conversation and voice activity for AI training unless you opt out. To opt out on copilot.com, select your profile icon, then your profile name, then Privacy, and turn off “Training on conversation activity” and “Training on voice conversations.” Opting out applies to future conversations only. Microsoft also says it doesn’t train on people signed in with a work or school Entra ID account, people who aren’t signed in, signed-in users under 18, or users in Brazil, China (excluding Hong Kong), Israel, Nigeria, South Korea and Vietnam.
Related: Is Microsoft Copilot free?, Does GitHub Copilot train on your code? and Does ChatGPT train on your data?
Source: Microsoft Support, “Microsoft Copilot for individuals: your activity history”; Microsoft Support, “Privacy FAQ for Microsoft Copilot”; Microsoft Support, “Microsoft Copilot privacy controls”
Image: Microsoft Copilot wordmark by Microsoft, public domain, via Wikimedia Commons. Copilot is a trademark of Microsoft. FreeAnswers is not affiliated with or endorsed by Microsoft.