Impersonation protection of tenant-owned domains for Teams messaging

Release notes for Microsoft Teams admin features

December 11, 2025

• Pop out your core apps into a new window: Users can now open their core applications, such as Chat, Teams, and more, in separate windows by selecting "Open in new window" from the app's context menu.
• Interpreter agent improvements: We're enhancing the Interpreter experience to deliver more accurate and consistent multilingual meeting experiences across interpretation, captions, and transcripts.

1. Auto-detect & auto-update spoken language: Previously, Interpreter automatically detected and updated spoken language for Interpreter agent, but Live Captions and Live Transcripts required users to manually configure their spoken language, even in the same meeting. With this improvement, spoken language is now autodetected and autoupdated consistently across Interpreter, Live Captions, and Live Transcripts. This ensures all speech features stay aligned with the actual language being spoken without manual setup.
2. Preparing status indicator: A new preparing status gives users clearer visual feedback when Interpreter is initializing, helping them understand when the system is ready. This is critical for those who rely on visual cues in multilingual meetings.
   1. Interpreter settings optimization: Concise explanations are added in Interpreter settings to clarify how each configuration and field works, reducing setup friction and user confusion.

• Impersonation protection of tenant-owned domains for Teams messaging: This feature lets users identify if an external user comes from a domain that's impersonating the recipient tenant's own domains, during their initial contact with an enterprise user via Teams messages.