The Microsoft 365 portal at portal.office.com offers robust security measures to protect user data. Key features include Multi-Factor Authentication (MFA), ensuring only authorized users access the platform. Data encryption is implemented both in transit and at rest, safeguarding sensitive information. Advanced Threat Protection (ATP) defends against phishing, malware, and zero-day threats. Admins can enforce Conditional Access policies, restricting access based on device, location, or risk level. Additionally, Security and Compliance Centers provide real-time monitoring, audit logs, and alerting. Microsoft Defender further enhances endpoint security, making portal.office.com a secure environment for managing emails, files, and collaboration tools.