Implement Microsoft Exchange Online Protection

Report spam, non-spam, phishing, suspicious emails and files to Microsoft - Microsoft Defender for Office 365

Microsoft Exchange Server Zero-Days (ProxyLogon) – Automatically Discover, Prioritize and Remediate Using Qualys VMDR | Qualys

Exchange Server vulnerabilities being exploited with ransomware, says Microsoft

Microsoft adds more mitigations to Exchange Server vulnerabilities as attackers ravage the exploits