Microsoft 365 Message Center item MC1465779
MC1465779 - Outlook for Mac: Sensitivity label recommendations and auto-labeling from attachments
Outlook for Mac will auto-apply or recommend Microsoft Purview sensitivity labels on emails based on attached files' labels, enhancing consistent information protection. This feature rolls out worldwide in late September 2026, requires no admin action, and helps reduce manual labeling while supporting compliance.
- Message Center ID
- MC1465779
- Category
- stay Informed
- Severity
- normal
- Services
- Exchange Online, Microsoft Purview
- Tags
- New feature, User impact, Admin impact
- Published
- 2026-09-01
- Last updated
- 2026-09-01
- Expires
- 2026-11-30
[What and Why:] We're introducing support in Outlook for Mac that can automatically apply or recommend Microsoft Purview sensitivity labels based on the sensitivity labels assigned to attached files. This enhancement helps organizations apply more consistent information protection by aligning email sensitivity labels with the classification of attached content. By reducing the need for manual labeling, organizations can help lower the risk of misclassified communications and support compliance and data protection objectives. [Rollout Schedule:] General Availability (Worldwide, GCC, GCC High, DoD): Rollout will begin in late September 2026 and is expected to complete in late September 2026. [Impact on Your Organization:] Who is affected: Users who compose email messages in Outlook for Mac. Organizations that use Microsoft Purview sensitivity labels. Platforms and Services: Outlook for Mac Microsoft Purview Information Protection What will happen: When users attach files that already have Microsoft Purview sensitivity labels, Outlook for Mac can automatically apply or recommend an appropriate sensitivity label for the email message. Email classification can better align with the sensitivity of attached content. Depending on your organization's label policies, users may see sensitivity label recommendations or automatic label application while composing messages. This capability helps reduce manual labeling effort and promotes a more consistent information protection experience across Outlook clients. [Action Required / Recommendations:] No admin action is required. We recommend that organizations using Microsoft Purview sensitivity labels: Review existing sensitivity label publishing and protection policies. Validate that attachment-based label inheritance behavior aligns with organizational compliance and information protection requirements. Inform compliance, security, and support teams of the upcoming change so they can address user questions. [Compliance Considerations:] Issue Explanation Microsoft Purview labeling behavior This change affects how Microsoft Purview sensitivity labels may be applied or recommended for email messages based on the sensitivity labels of attached files. Information protection and compliance workflows Organizations should verify that automatic or recommended label inheritance aligns with their existing classification and protection requirements.