Microsoft Teams: AI Interpreter (simultaneous) quality improvements and new Traditional Chinese support

Updated May 18, 2026: We have updated the timeline. Thank you for your patience.  Introduction We’re updating AI Interpreter in Microsoft Teams to deliver more accurate and consistent real-time interpretation. These improvements enhance recognition of people’s names and common industry terminology, and Interpreter will now use your organization’s Custom Dictionary from the Microsoft 365 admin center to reflect preferred terms across meetings. This update also expands language availability with the addition of Traditional Chinese. This message is associated with Microsoft 365 Roadmap ID 558434. When this will happen Targeted Release: Rolling out in late April 2026 (previously early April) and expected to complete in late April 2026 (previously mid-April). General Availability (Worldwide): Rolling out in late April 2026 (previously mid-April) and expected to complete in early June 2026 (previously late April). How this affects your organization Who is affected Organizations using Microsoft Teams multilingual meetings with Interpreter, live captions, or transcripts, and users licensed for Microsoft 365 Copilot What will happen AI Interpreter accuracy will improve for real-time interpretation. Recognition of people’s names and industry-specific terminology will be more consistent. Interpreter will use your tenant’s Custom Dictionary from the Microsoft 365 admin center to improve translation consistency. Traditional Chinese will be added as a supported language:  This update applies to all currently supported languages: English Simplified Chinese Traditional Chinese French German Italian Japanese Korean Portuguese Spanish The AI Interpreter experience requires a Microsoft 365 Copilot license for users. Existing admin policies and configurations are unchanged. The feature will be enabled by default for eligible, licensed users. What you can do to prepare No admin action is required before rollout. To ensure users can take advantage of this update, you may want to: Confirm that users who need AI Interpreter are assigned a Microsoft 365 Copilot license. Review and maintain Custom Dictionary entries in the Microsoft 365 admin center. Update internal documentation or helpdesk materials if needed. Communicate this update to Teams meeting organizers and interpreters who rely on multilingual capabilities. Compliance considerations No compliance considerations identified. Review as appropriate for your organization.