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Upcoming Change to Teams Desktop Client on Windows
Microsoft Teams Desktop Client for Windows will introduce a new process, ms-teams_modulehost.exe, to handle calling features separately, improving performance and startup time. Rollout begins January 2026. Admins should allowlist the new process in security software and inform helpdesk staff; no user workflow changes expected.
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.
What you can do to prepare:
- 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.
- Learn more about Teams performance improvements: https://learn.microsoft.com/microsoftteams/Microsoft Teams documentation.
Compliance considerations:
No compliance considerations identified, review as appropriate for your organization.
Message ID: MC1189656
