Cybersecurity threats continue to evolve, and many small and mid-sized businesses are surprised to learn that their Microsoft 365 environment is not fully secured by default.
Microsoft 365 includes powerful security features that can significantly reduce the risk of account compromise, ransomware, business email compromise, and unauthorized access. Unfortunately, many organizations never fully configure these settings, leaving critical gaps in their security posture.
Below are ten Microsoft 365 security settings every business should review and enable.
Enable Multi-Factor Authentication (MFA)
If your organization only implements one security measure, make it Multi-Factor Authentication.
MFA requires users to verify their identity using a second factor such as the Microsoft Authenticator app, significantly reducing the risk of compromised passwords leading to unauthorized access.
Why it matters:
- Blocks the majority of credential-based attacks
- Protects remote workers
- Reduces account takeover risk
Implement Conditional Access Policies
Conditional Access allows organizations to control how users access Microsoft 365 resources based on factors such as location, device compliance, risk level, and user role. Examples include blocking sign-ins from foreign countries, requiring MFA for administrative accounts, or restricting access from unmanaged devices.
Why it matters:
- Adds intelligent access control
- Reduces unauthorized access
- Improves overall security posture
Disable Legacy Authentication
Legacy authentication protocols such as POP, IMAP, and older Exchange methods do not support modern security controls like MFA. Cybercriminals frequently target these protocols to bypass security protections.
Why it matters:
- Eliminates a common attack vector
- Improves Microsoft Secure Score
- Strengthens account security
Secure Administrative Accounts
Administrative accounts should never be used for day-to-day activities. Organizations should create dedicated admin accounts, require MFA, limit administrative privileges, and implement just-in-time access when possible.
Why it matters:
- Reduces privilege abuse
- Limits attack surface
- Protects critical systems
Enable Microsoft Defender for Office 365
Microsoft Defender provides advanced protection against phishing attacks, malware, business email compromise, malicious links, and malicious attachments.
Why it matters:
- Protects users from modern threats
- Enhances email security
- Reduces phishing risk