Message preview for channels, mentions, and reactions notifications

Microsoft Teams will add message previews to channel, mention, and reaction notifications on Windows, Mac, and web starting mid-December 2025. Users can disable previews via notification settings. No admin action or policy changes are needed; the feature activates with client updates. This message applies to Teams for Windows desktop, Teams for Mac desktop and Teams for the web. Screenshot: @mention notification with message preview View image in new tab When this will happen: Targeted Release (Worldwide): Rollout begins mid-December 2025; expected to complete by mid-December 2025 General Availability (Worldwide): Rollout begins mid-January 2026; expected to complete by mid-January 2026 General Availability (GCC, GCC High, DoD): Rollout begins mid-January 2026; expected to complete by late January 2026 How this affects your organization: Who is affected: All users of Microsoft Teams on Windows and Mac desktop clients and Teams on the web. What will happen: Notifications for channels, mentions, and reactions will include a message preview, unless the message preview is disabled by users. Users can disable previews: On Windows and Web: via Teams Notification Settings. On Mac: via OS Notification Settings. No changes to existing admin policies; no policy updates required. What you can do to prepare: Compliance considerations: No admin action is required; the feature will be available automatically once users update to the supported Teams client build. Consider notifying your users about this update and how they can manage notification settings. Message ID: MC1191916

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