Upcoming Change to the Microsoft Teams Desktop Client on Windows: New Module Host for Calling

Upcoming Change to the Microsoft Teams Desktop Client on Windows: New Module Host for Calling

Microsoft is introducing an important architectural update to the Teams Desktop Client for Windows that enhances performance, reduces startup time, and improves the reliability of calling features. For IT administrators, UC engineers, and organizations using Microsoft Teams Calling, this update requires a few proactive adjustments.

What Is Changing?

In the current Teams architecture, the main application process ms-teams.exe also launches and manages the calling stack. To improve performance and create cleaner separation, Microsoft is introducing a dedicated child process for handling all calling-related functionality.

What’s New in Microsoft Teams Calling, Meetings & Devices – October 2025

Microsoft introduced a new set of updates across Teams Phone, Meetings, Town Halls, and Teams Rooms. This month focuses on AI improvements, hybrid meeting quality, and stronger admin tools.

Key Highlights

• Intelligent Recap pop-out for Teams calls
• Teams Phone Mobile now GA with AT&T
• Improved call transfer experience on Teams-certified phones
• Audio Recap now generally available
• Multi-camera & IntelliFrame upgrades in Teams Rooms
• Ultra-Low Latency and 1080p video for Town Halls (Premium)
• New admin insights in Teams Rooms Pro Management

Teams Phone

Intelligent Recap in the Calls App

Users can now open call summaries directly from call history. The pop-out window includes AI-generated notes, key points, and follow-up suggestions.