Microsoft Defender for Office 365 will introduce an opt-in Safe Attachments policy to quarantine emails with password-protected attachments that cannot be scanned. Administrators can control release, users can self-release with passwords, and the feature supports various file types. Rollout begins August 2026 worldwide.
Day in brief
Migrate from Advanced Threat Analytics (ATA) to Microsoft Defender for Identity leads 2 Defender updates
27 July 2026 recorded 1 updated Microsoft Defender documentation changes and 1 relevant Message Center announcement. The most active areas were Identity, Defender XDR.
- Migrate from Advanced Threat Analytics (ATA) to Microsoft Defender for Identity
Identity · Identity protectionUpdated Microsoft Defender documentation in defender-for-identity/migrate-from-ata-overview.md.
- MDO Encrypted email attachment protection
Defender XDR · Email and collaborationMicrosoft Defender for Office 365 will introduce an opt-in Safe Attachments policy to quarantine emails with password-protected attachments that cannot be scanned. Administrators can control release, users can self-release with passwords, and the feature supports various file types. Rollout begins August 2026 worldwide.
This period briefing was assembled from the tracked Microsoft Learn and Message Center changes.
2 updates
Microsoft Defender XDR
1 updateMicrosoft Defender for Identity
1 updateUpdated Microsoft Defender documentation in defender-for-identity/migrate-from-ata-overview.md.