Outlook: External tag in profile cards

To enhance user awareness and communication security, the profile card in Outlook will soon include a visual indicator to help users identify external participants in email conversations. This update improves clarity and reduces the risk of sharing sensitive information with unintended recipients. This message is associated with Microsoft 365 Roadmap ID 498231 When this will happen General Availability (Worldwide): Rollout will begin in mid-September 2025 and is expected to complete by late September 2025. How this affects your organization Once this update is deployed, Outlook users will see a clear visual cue on a user's profile card when communicating with individuals outside their organization. This feature is designed to reduce accidental data sharing and improve user confidence when managing external communications. The feature will be enabled by default and does not require configuration. What you can do to prepareNo preparation is needed. However, we recommend informing your users about this change to reduce confusion and support adoption. Compliance considerations No compliance considerations identified, review as appropriate for your organization.