https://www.bleepingcomputer.com/news/security/office-365-adds-malware-zap-toggle-to-security-and-compliance-center/

Microsoft's developers are adding a new malware Zero-hour Auto Purge (ZAP) toggle to the Office 365 Security & Compliance Center to allow configuration without using a PowerShell cmdlet.

The ZAP Exchange Online feature is designed to detect and remove phishing, spam, or malicious email messages that for one reason or another — usually this happens when an attacker enables the malicious part after delivery — have already landed in an Office 365 user's inbox.