Conditional Access vs Security Defaults in Microsoft 365: Key Differences Explained

Conditional Access and Security Defaults in Microsoft Entra ID are both designed to improve Microsoft 365 security, but they differ significantly in flexibility and control. Security Defaults provide automatic baseline protections such as MFA and legacy authentication blocking, while Conditional Access enables granular, policy-based access control using conditions like location, device compliance, and user risk.

Quick Comparison

Feature	Legal Hold	Retention Policies
Customization	High	Limited
Complexity	Advanced	Simple
Policy Control	Granular	Preconfigured
Best Use Case	Enterprise security control	Basic identity protection

What is Conditional Access?

Conditional Access is a Microsoft Entra ID feature that evaluates:

• User identity
• Device compliance
• Sign-in risk
• Location
• Application access

It then applies security controls such as:

• MFA
• Access blocking
• Session restrictions
• Device requirements

👉 Conditional Access is designed for granular identity security control.

What are Security Defaults?

Security Defaults are Microsoft-recommended baseline security settings that automatically:

• Enforce MFA
• Block legacy authentication
• Protect admin accounts
• Enable basic identity protections

👉 Security Defaults are designed for simple, automatic security improvement with minimal configuration.

Key Differences Between Conditional Access and Security Defaults

1. Flexibility

Conditional Access

Provides:

• Granular policy creation
• User targeting
• App-specific controls
• Risk-based enforcement

Security Defaults

Provides:

• Fixed Microsoft-managed protections
• Minimal customization

👉 Conditional Access offers significantly more control.

2. Complexity

Conditional Access

Requires:

• Policy planning
• Testing
• Ongoing management

Security Defaults

Can be enabled quickly with minimal setup.

👉 Security Defaults are easier for smaller organizations.

3. MFA Enforcement

Conditional Access

Allows:

• Selective MFA enforcement
• Risk-based MFA
• Context-aware authentication

Security Defaults

Automatically enforces MFA broadly.

👉 Conditional Access enables smarter MFA decisions.

4. Legacy Authentication Blocking

Conditional Access

Can block legacy authentication selectively.

Security Defaults

Automatically blocks legacy authentication.

5. Licensing Requirements

Conditional Access

Requires Microsoft Entra ID Premium licenses (P1/P2).

Security Defaults

Available at no additional cost in many tenants.

👉 This is a major deciding factor for many organizations.

Conditional Access vs Security Defaults Table

When to Use Conditional Access

Use Conditional Access when:

• 🔐 Advanced security controls are needed
• 🌍 Access must vary by location or device
• ⚠️ Risk-based policies are required
• 🏢 Enterprise-grade security is needed

When to Use Security Defaults

Use Security Defaults when:

• ⚡ Quick security improvements are needed
• 🏢 Small organizations lack dedicated security teams
• 🔐 Basic MFA enforcement is sufficient
• 💰 Premium licensing is unavailable

Can Conditional Access and Security Defaults Be Used Together?

Generally, organizations using advanced Conditional Access policies disable Security Defaults because:

• Policies may overlap
• Enforcement can conflict
• Conditional Access provides more flexibility

👉 Most mature environments transition from Security Defaults to Conditional Access.

Common Mistakes

• ❌ Using Security Defaults when granular policies are required
• ❌ Deploying Conditional Access without testing
• ❌ Locking out admins accidentally
• ❌ Ignoring emergency access accounts

Related Microsoft 365 Concepts

• Conditional Access
• Security Defaults
• Multi-Factor Authentication (MFA)
• Identity Protection
• Microsoft Entra ID

Frequently Asked Questions

• What is the difference between Conditional Access and Security Defaults?

Conditional Access provides granular, customizable security policies, while Security Defaults offer automatic baseline protections with limited configuration.

• Which is better: Conditional Access or Security Defaults?

Conditional Access is better for organizations requiring advanced security controls, while Security Defaults are better for organizations seeking simple, quick security improvements.

• Does Conditional Access require a license?

Yes, Conditional Access requires Microsoft Entra ID Premium licenses such as P1 or P2.

• Are Security Defaults free?

Yes, Security Defaults are available at no additional cost in many Microsoft Entra ID environments.

• Can Conditional Access enforce MFA?

Yes, Conditional Access can require MFA based on conditions such as user location, device compliance, and risk level.

• Do Security Defaults block legacy authentication?

Yes, Security Defaults automatically block legacy authentication protocols.

• Can Conditional Access and Security Defaults work together?

Typically, organizations disable Security Defaults when implementing advanced Conditional Access policies to avoid overlapping enforcement.

• Why is Conditional Access important?

Conditional Access is important because it enables organizations to apply intelligent, context-aware security controls to protect Microsoft 365 resources.

Conclusion

Conditional Access and Security Defaults both improve Microsoft 365 identity security, but they are designed for different levels of control and complexity. Security Defaults provide simple baseline protections, while Conditional Access enables advanced, policy-driven security enforcement. Understanding their differences helps organizations choose the right approach for their Microsoft Entra security strategy.