The Microsoft 365 Copilot app for Windows will change its executable name from Webviewhost.exe to M365Copilot.exe after late October 2025. The update is automatic for Microsoft Store users with auto-updates enabled. No functionality changes occur; update dependencies if needed.
Applies to: Microsoft 365 suite · Microsoft 365 apps
Source: mc.merill.net — data via Merill Fernando's open archive (MIT).