Zero Trust Architecture: 6 Pillars

• Why Architecture Matters
• Identity
• Devices
• Applications
• Data
• Infrastructure
• Network
• How the 6 Pillars Connect to Your Roadmap

Zero Trust is easiest to implement when you have a clear picture of what needs to be protected and how different controls relate to each other. The six pillars of Zero Trust provide that structure and make it easier to align security projects with business risk.

Why Architecture Matters

Without an architecture view, Zero Trust can feel like many disconnected settings across identity, devices, applications, and data. An architectural model helps leadership and technical teams see how decisions in one area, such as identity, affect what is possible in others, such as device compliance or data loss prevention.

For Microsoft 365 customers, Microsoft’s Zero Trust guidance emphasizes that all six pillars must work together: identity, endpoints, applications, data, infrastructure, and network. Treating them as one architecture makes it easier to plan changes and avoid duplicating effort across tools.

Identity

The identity pillar focuses on verifying users, service accounts, and administrators before granting access. In Microsoft 365, this usually means Entra ID, strong authentication, role-based access, and protection against identity compromise.

Identity controls determine who can sign in, how they prove who they are, and which privileges they receive. Decisions about Entra ID licensing, sign-in policies, and privileged access management all live in this pillar and influence every other area of the architecture.

Devices

The device pillar is about knowing which devices are accessing resources and what condition they are in. This includes desktops, laptops, mobile devices, and other endpoints connecting to Microsoft 365 services.

In practice, this often involves Intune-based management and compliance policies that check whether a device is up to date, protected, and configured according to your standards. Device signals then feed back into access decisions, helping enforce that only trusted devices can reach sensitive workloads.

Applications

The application pillar covers how cloud and on-premises applications are discovered, protected, and managed. In a Microsoft 365 context, that includes first-party apps such as Exchange Online and SharePoint, as well as third-party SaaS and line-of-business applications.

Here the focus is on controlling how applications handle authentication, what permissions they ask for, and how they are integrated with Entra ID. Conditional access, app governance, and application discovery all contribute to keeping this pillar under control.

Data

The data pillar is concerned with understanding what data you have, where it lives, and how it is used. In Microsoft 365, this often maps to classification, labeling, encryption, and data loss prevention policies.

Data controls help ensure that sensitive information is labeled correctly, accessed only by appropriate users, and protected when it leaves managed environments. As the architecture matures, this pillar becomes a key driver for decisions about sharing, retention, and regulatory requirements.

Infrastructure

The infrastructure pillar focuses on servers, virtual machines, containers, and other compute resources that support your applications and data. Even for cloud-first organizations, there are still infrastructure components that must be monitored and secured.

In Microsoft-focused environments, this can include Azure workloads, hybrid servers, and supporting services that connect on-premises systems to the cloud. The goal is to apply Zero Trust principles to administrative access, configuration, and monitoring for these resources.

Network

The network pillar deals with how traffic flows between users, devices, applications, and data. Under a Zero Trust model, the network is no longer treated as trusted just because it is “internal.”

Instead, access paths are segmented and evaluated, often using modern approaches such as micro-segmentation and secure remote access. In Microsoft environments, traditional VPN-centric models are gradually replaced or complemented by identity- and application-aware access controls.

How the 6 Pillars Connect to Your Roadmap

The six pillars of Zero Trust architecture help you map existing tools and proposed projects to a single model. That makes it much easier to explain to stakeholders why certain initiatives should come first and how they contribute to the broader security story.

If you want to see how these pillars translate into a sequence of concrete steps, review our 12-Month Zero Trust Roadmap. You can also connect this architectural view to identity-focused licensing decisions in Entra ID P1 vs P2 and to endpoint strategy in Intune Plan 1 vs 2 vs Suite.

For organizations that are ready to move from understanding the architecture to acting on it, start with our Zero Trust Assessment or Microsoft 365 Security 90 Days. If your next priority is implementation, review our Entra ID Deployment, Intune Suite Deployment, and Defender XDR Setup services.