Executable name update for Microsoft 365 Copilot app for Windows
From Microsoft 365 Message Center Archive by Merill Fernando · Microsoft may not have sent this notice to your tenant.Rollout
Rollout dates are often only in the text. When Microsoft moves them, the change shows under "What changed".
Schedule dates changed in the text
Date phrases in schedule sentences differ between the versions this installation saw- Seen 30 Sep 2025
late September 2025→ late October 2025 - Seen 24 Sep 2025
September 20, 2025→ late September 2025
Read from date phrases in Microsoft's text, not from notice metadata. A changed phrase can be a moved rollout, a new milestone or just rewording; "What changed" below shows which.
What the notice says
Microsoft’s text, safely structuredUpdated 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).
How this affects your organization
With the change, the executable name for the Microsoft 365 Copilot Windows app will change from Webviewhost.exe to M365Copilot.exe. For users who installed the app via the Microsoft Store, the update will happen automatically on September 20 if their device settings allow for automatic updates. For users who installed the app through other platforms or have settings that do not allow automatic updates, the change will happen once users update their app.
This update does not affect app functionality or user experience.
What you can do to prepare
No action is required unless your organization has dependencies on Webviewhost.exe. If so, update those references to M365Copilot.exe to ensure continued functionality.
Compliance considerations
No compliance considerations identified, review as appropriate for your organization.
What changed
Between archive captures, newest firstUpdated September
24,30, 2025: We have updated the timeline. Thank you for your patience.SeptemberOctober 2025 (previouslySeptember 20).late September). How this affects your organization: With the change, the executable name for …- Tags
Feature update, User impact, Admin impact→ Updated message, Feature update, User impact, Admin impact
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 … will roll out to affected users with the next app update after late September
20, 2025.2025 (previously September 20). How this affects your organization: With the change, the executable name for …- Tags
- · first version seen
Related public evidence
No related evidence found in this installation's recent collection. This does not establish that no announcement exists.
Not confirmed here
What this page cannot tell you- Whether your tenant is affected: this is Microsoft's notice, not a check of your settings.