MC1221925 – Microsoft 365 Copilot: Custom dictionary expands language support and increases limits for Teams meeting transcripts

Product:

Copilot, Microsoft 365 Copilot, Teams, Windows

Platform:

Android, iOS, Mac, Online, Web, World tenant

Status:

Change type:

Feature update, User impact, Admin impact

Links:

Details:

Summary:
Microsoft 365 Copilot’s custom dictionary now supports more languages, doubles per-language entry limits to 1,000, and allows incremental CSV uploads for easier management. These updates improve Teams meeting transcript accuracy and will roll out globally by late January 2026, enabling enhanced Copilot and Intelligent Recap features automatically.

Details:
[Introduction]
We're enhancing the custom dictionary feature in Copilot Settings to add support for more languages, increase per‑language dictionary limits, and streamline dictionary management. These improvements help organizations improve transcript accuracy for Microsoft Teams meetings and support better Copilot and Intelligent Recap experiences. This update also aligns with customer feedback requesting broader language coverage and easier ongoing dictionary maintenance.
A Microsoft 365 Copilot license is required for the meeting organizer or transcription initiator to apply transcript enhancements that rely on custom dictionary entries.
This update applies to Teams meeting transcripts on Teams for Windows, Teams for Mac, Teams for the web, and Teams for iOS and Android.
[When this will happen]
General Availability (Worldwide): Rollout began in mid-January 2026 and is expected to complete by late January 2026.

Change Category:
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Scope:
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Release Phase:

Created:
2026-01-24

updated:
2026-01-24

Task Type

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Docu to Check

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MS How does it affect me

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summary for non-techies**

Microsoft 365 Copilot is updating its custom dictionary in Teams to support more languages, like Korean and Turkish, and allow up to 1,000 words per language, simplifying the process of adding new terms by enabling users to upload a small file instead of rewriting the entire list.

Direct effects for Operations**

Expanded Language Support
The addition of new languages may lead to confusion among users who are not familiar with the new language options, potentially affecting the accuracy of meeting transcripts and user experience during meetings.
   - roles: Users, Admins
   - references: https://learn.microsoft.com/microsoftteams/copilot-custom-dictionary

Increased Entry Limits
Doubling the per-language entry limits may overwhelm admins who manage custom dictionaries, leading to potential mismanagement of entries and decreased transcript accuracy if not properly handled.
   - roles: Admins, Users
   - references: https://learn.microsoft.com/microsoftteams/copilot-custom-dictionary

Configutation Options**

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Data Protection**

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explanation for non-techies**

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