Microsoft 365 is the dominant productivity platform for businesses. Security misconfigurations expose sensitive data. Proper configuration and monitoring protect against threats.

Authentication Security

Enable multi-factor authentication (MFA) for all users. MFA blocks 99.9% of account compromise attacks. Conditional access policies require MFA for risky scenarios: unusual locations, unusual times, or unusual devices.

Disable legacy authentication protocols. Modern clients support modern authentication. Legacy protocols are vulnerable to password spray attacks.

"MFA blocks 99.9% of account compromise attacks"

Data Protection

Enable Data Loss Prevention (DLP) policies to prevent sensitive data from leaving the organization. DLP can block emails containing credit card numbers, social security numbers, or other sensitive data.

Enable encryption for sensitive data. Sensitivity labels automatically encrypt documents and restrict sharing. Users can share encrypted documents with external parties while maintaining control.

Security Controls

  • Enable MFA
  • Conditional access
  • Data loss prevention
  • Encryption
  • Threat protection
  • Audit logging

Threat Protection

Enable Advanced Threat Protection (ATP) for email and Office documents. ATP sandboxes suspicious attachments and detonates them in isolated environments to detect malicious behavior.

Enable Defender for Office 365 to detect phishing and malware. Real-time protection blocks threats before they reach users.

Monitoring and Compliance

Enable audit logging to track user activities. Audit logs record email access, file modifications, and administrative actions. Logs are retained for 90 days by default—extend retention for compliance.

Use compliance manager to track compliance with regulations. Compliance manager provides assessments and recommendations for meeting compliance requirements.