![(Updated) Upcoming Change to Teams Desktop Client on Windows [MC1189656]](https://mwpro.co.uk/wp-content/uploads/2024/08/pexels-cottonbro-4904564-1024x683.webp "(Updated) Upcoming Change to Teams Desktop Client on Windows [MC1189656] 1")
Updated November 25, 2025: We have updated the content below to show as intended. Thank you for your feedback.
[Introduction]
We’re improving the performance and startup time of calling features in the Microsoft Teams Desktop Client for Windows. To achieve this, we’re introducing a new child process named ms-teams_modulehost.exe that will handle the calling stack separately from the main application process (ms-teams.exe). This change optimizes resource usage and enhances meeting experiences.
[When this will happen:]Worldwide, GCC, GCC High, and DoD: Rollout will begin early January 2026 and complete by late January 2026.
Note: Timelines may shift due to year-end feature flag rollout freeze.
[How this affects your organization:]- Who is affected: All users running the Teams Desktop Client on Windows.
- What will happen:
- A new process (ms-teams_modulehost.exe) will appear in Task Manager under the main Teams process (ms-teams.exe).
- This process is dedicated to calling features and improves performance.
- No changes to user workflows or UI; however, admins should ensure endpoint and security software allow this new process.
- Update endpoint management and security software to allowlist ms-teams_modulehost.exe alongside ms-teams.exe.
- Communicate this change to helpdesk staff to avoid confusion during troubleshooting.
- Update internal documentation if you reference Teams process names.
No compliance considerations identified, review as appropriate for your organization.
Source: Microsoft
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