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

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