External Recipients Banner on Outlook Mobile
Rollout
Rollout dates are often only in the text. When Microsoft moves them, the change shows under "What changed".
What the notice says
Microsoft's text, with its sections, lists and tables; source markup removedWhat 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.
What changed
Between the versions this installation saw, newest firstThis installation has seen one version of this notice, first on 19 Oct 2026. Later changes will show here.
Linked documentation
Microsoft pages the notice links toThe notice links to no Microsoft Learn or Support page that this installation reads.
Not confirmed here
What this page cannot tell you- Whether your tenant is affected: this is Microsoft's notice, not a check of your settings.