The short answer
Identity, device state, and threat risk inform access
Microsoft Entra manages identity, authentication, and access decisions. Microsoft Intune manages devices, apps, configuration, and compliance state. Microsoft Defender detects and responds to threats and can contribute device risk. Conditional Access in Entra can combine those signals to allow, challenge, limit, or block access.
The decision loop
Each product answers a different security question
| Layer | Core question | Signal or control |
|---|---|---|
| Microsoft Entra | Who is requesting access, under what conditions? | Identity, authentication, sign-in risk, roles, and Conditional Access |
| Microsoft Intune | Is the device or app managed and compliant with policy? | Configuration, compliance state, app protection, device management |
| Microsoft Defender | Is there active or emerging threat risk? | Threat detection, endpoint risk, investigation, and response |
| Conditional Access | Given these signals, should access be allowed? | Require MFA, require compliant device, restrict session, or block |
One practical example
A sign-in is more than a password check
A user signs in to Microsoft 365. Entra knows the identity and sign-in context. Intune reports whether the device meets the organization's compliance policy. Defender can provide a device risk signal. Conditional Access evaluates the combined policy conditions and determines whether access is allowed, requires an additional control, or is blocked.
The products remain distinct. Their value increases when policy owners agree on how the signals should affect access.
Why not only one product?
No single layer answers the full question
Entra alone
Can authenticate and control access, but it needs reliable device and risk signals for device-aware, risk-based decisions.
Intune alone
Can manage and evaluate devices and apps, but it does not replace identity-based access policy or threat detection.
Defender alone
Can detect threats and device risk, but it does not replace device lifecycle management or identity access decisions.
The combined system
Becomes relevant when access must adapt to identity, device compliance, and threat conditions together.
Evidence before a licensing decision
Define the policy outcome first
- Which identities, applications, and data require stronger controls?
- Which device states should count as compliant, and who owns exceptions?
- Which risk signals should challenge or block access?
- How will emergency access and recovery remain possible?
- Which incidents, access failures, or unmanaged devices establish the baseline?
Public Microsoft sources
Verify the current security relationship
- What is Microsoft Entra?Identity and network access product family overview
- What is Microsoft Intune?Endpoint management, apps, devices, and organizational data
- Protect data and devices with Microsoft IntuneDefender integration, compliance, risk signals, and Conditional Access
- What is Microsoft Defender for Business?SMB endpoint protection and its relationship to Business Premium
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