External Recipients Banner on Outlook Mobile

Outlook Mobile will display a banner warning when external attendees are added to meetings, rolling out worldwide from late October to late November 2026. This helps prevent accidental sharing with external recipients. No action or compliance changes are required. What and Why: When you add an attendee outside your organization to a meeting, Outlook will display a banner warning you that external recipients are included. Rollout Schedule: General Availability (Worldwide): We will begin rolling out on late October 2026 and expect to complete by late November 2026. Impact on Your Organization: Helps users avoid accidentally inviting external attendees to meetings by clearly identifying recipients outside their organization, reducing the risk of unintentionally sharing sensitive information. Action Required/Recommendations: No action is required Compliance considerations: No compliance considerations identified. Review as appropriate for your organization. Message ID: MC1515932

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