check before: 2025-10-31
Product:
Copilot, Microsoft 365 Apps, Microsoft 365 Copilot, Microsoft 365 suite
Platform:
Developer, Online, Web, World tenant
Status:
Change type:
Admin impact, Feature update, Updated message, User impact
Links:
Details:
Summary:
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.
Details:
Updated September 30, 2025: We have updated the timeline. Thank you for your patience.
To better reflect the identity and functionality of the Microsoft 365 Copilot app, we are updating the executable name on Windows devices. This change improves clarity for IT admins, developers, and users managing diagnostics or process monitoring.
When this will happen:
This update will roll out to affected users with the next app update after late October 2025 (previously late September).
Change Category:
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Scope:
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Release Phase:
Created:
2025-08-26
updated:
2025-09-30
Task Type
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Docu to Check
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MS How does it affect me
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MS Urgency
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summary for non-techies**
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Direct effects for Operations**
Executable Name Change
If the executable name is changed without updating dependencies, applications or scripts relying on Webviewhost.exe may fail to function properly, leading to disruptions in user workflows.
- roles: IT Admin, Developer
- references: https://techcommunity.microsoft.com/t5/microsoft-365-copilot-blog/executable-name-update-for-microsoft-365-copilot-app-for-windows/ba-p/3823450
Automatic Update Issues
Users who have disabled automatic updates may not receive the new executable name, leading to confusion and potential errors when troubleshooting or monitoring processes.
- roles: End User, IT Support
- references: https://techcommunity.microsoft.com/t5/microsoft-365-copilot-blog/executable-name-update-for-microsoft-365-copilot-app-for-windows/ba-p/3823450
User Experience Disruption
Users may experience a temporary disruption in their workflow if they are unaware of the executable name change and encounter issues with applications that depend on the old name.
- roles: End User, IT Support
- references: https://techcommunity.microsoft.com/t5/microsoft-365-copilot-blog/executable-name-update-for-microsoft-365-copilot-app-for-windows/ba-p/3823450
Configutation Options**
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Opportunities**
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Potentional Risks**
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IT Security**
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explanation for non-techies**
The change in the executable name for the Microsoft 365 Copilot app is similar to renaming a file folder on your computer. Imagine you have a folder labeled "Old Projects" that you've been using for a while. Over time, you realize it would be more helpful to call it "Completed Projects" to better reflect its contents. The contents of the folder remain the same, but the new name makes it clearer and easier to understand what the folder is about.
In the same way, Microsoft is changing the name of the executable file for the Copilot app from "Webviewhost.exe" to "M365Copilot.exe." This change doesn't alter how the app works or how you use it; it simply makes it clearer what the file is associated with, especially for those who manage or monitor these processes.
For most users, this update will happen automatically if their settings allow for it, much like how your phone updates apps when connected to Wi-Fi. If your organization relies on the old name for certain processes, like a shortcut pointing to the old folder name, you'll need to update those references to the new name to ensure everything continues to work smoothly.
There are no compliance issues with this change, but it's always a good idea to review any organizational policies to make sure everything aligns with your internal guidelines.
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change history
| Date | Property | old | new |
| 2025-09-30 | MC Messages | Updated September 24, 2025: We have updated the timeline. Thank you for your patience.
To better reflect the identity and functionality of the Microsoft 365 Copilot app, we are updating the executable name on Windows devices. This change improves clarity for IT admins, developers, and users managing diagnostics or process monitoring. When this will happen: This update will roll out to affected users with the next app update after late September 2025 (previously September 20). | Updated September 30, 2025: We have updated the timeline. Thank you for your patience.
To better reflect the identity and functionality of the Microsoft 365 Copilot app, we are updating the executable name on Windows devices. This change improves clarity for IT admins, developers, and users managing diagnostics or process monitoring. When this will happen: This update will roll out to affected users with the next app update after late October 2025 (previously late September). |
| 2025-09-30 | MC Last Updated | 09/24/2025 18:27:37 | 2025-09-30T21:12:33Z |
| 2025-09-30 | MC Summary | The Microsoft 365 Copilot app for Windows will update its executable name from Webviewhost.exe to M365Copilot.exe after late September 2025. The change improves clarity for management and does not affect functionality. Organizations with dependencies on the old name should update references accordingly. | 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. |
| 2025-09-24 | MC Messages | To better reflect the identity and functionality of the Microsoft 365 Copilot app, we are updating the executable name on Windows devices. This change improves clarity for IT admins, developers, and users managing diagnostics or process monitoring.
When this will happen: This update will roll out to affected users with the next app update after September 20, 2025. | Updated September 24, 2025: We have updated the timeline. Thank you for your patience.
To better reflect the identity and functionality of the Microsoft 365 Copilot app, we are updating the executable name on Windows devices. This change improves clarity for IT admins, developers, and users managing diagnostics or process monitoring. When this will happen: This update will roll out to affected users with the next app update after late September 2025 (previously September 20). |
| 2025-09-24 | MC Title | Executable name update for Microsoft 365 Copilot app for Windows | (Updated) Executable name update for Microsoft 365 Copilot app for Windows |
| 2025-09-24 | MC Last Updated | 08/26/2025 00:42:05 | 2025-09-24T18:27:37Z |
| 2025-09-24 | MC MessageTagNames | Feature update, User impact, Admin impact | Updated message, Feature update, User impact, Admin impact |
| 2025-09-24 | MC Summary | The Microsoft 365 Copilot app for Windows will change its executable name from Webviewhost.exe to M365Copilot.exe after September 20, 2025. The update is automatic for Microsoft Store users with auto-updates enabled. No functionality changes occur, but organizations should update dependencies if needed. | The Microsoft 365 Copilot app for Windows will update its executable name from Webviewhost.exe to M365Copilot.exe after late September 2025. The change improves clarity for management and does not affect functionality. Organizations with dependencies on the old name should update references accordingly. |
Last updated 4 weeks ago ago
