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.
Applies to: Microsoft Defender XDR
Source: mc.merill.net — data via Merill Fernando's open archive (MIT).