Microsoft Explains the Differences Between Copilot Memories

Copilot memory is a term that refers to different things, including Copilot communication memory, a method to use the Graph to personalize responses for users. The idea is to use all the sources of information available through the Graph as Copilot responds to user prompts in Microsoft 365 apps instead of limiting sources to whatever the app works with. It’s a good idea, providing the Graph sources are accurate.

https://office365itpros.com/2025/09/03/copilot-memory-types/