Microsoft 365 Copilot chat will preserve conversations by creating session entries in the navigation pane upon prompt submission, allowing users to return without losing progress. This update, rolling out from December 2025 to June 2026, requires no admin action and improves chat reliability across all environments.
Applies to: Microsoft 365 Copilot Chat
Source: mc.merill.net — data via Merill Fernando's open archive (MIT).