Take a look and decide whether this affects your tenant, users or support teams.
Primary Audience
Why this score?
AT A GLANCE
END USERS
IT ADMINS
ROLLOUT TIMELINE
Late October 2026
📢 Official Microsoft Message Center Announcement
External Recipients Banner on Outlook Mobile
Message ID: MC1515932
[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.
Source: Microsoft Message Center • Analysed by MWPro
