Zero Trust architecture is not one build. It is 5 separate trade-off decisions: how broad identity policies should be, whether to block endpoints on day one or watch first, whether to classify data before writing DLP rules, how much incident response to automate, and whether to sequence rollout pillar-by-pillar or stage-by-stage. Security architects and CISOs get a decision framework for each one, not a checklist.

Most security policies get written for auditors, then copied unchanged into board packets, where they go unread. This piece gives security architects and CISOs a 4-question framework for translating any M365 technical control, Conditional Access, Intune, or beyond, into a 3-line executive summary a board will actually act on. Includes 2 worked examples and a free GitHub template kit.

A Conditional Access policy that required an app protection policy nobody deployed in Intune blocked mobile users on day one. For security architects and CISOs: a 7-layer dependency model for Microsoft 365 tenant security, Cloud Harbor Consulting's 5-step build sequence for Entra ID, Intune, Conditional Access, Purview, and Defender XDR, and the verification step that closes gaps like this before they ship.

Onboarding a device to Microsoft Defender for Endpoint turns on the sensor that sends telemetry. It does not turn on the controls that stop an attack. A device can report "healthy" while nothing blocks files on disk. For the engineers who run MDE rollouts and the leaders who fund them: the five gaps that leave a finished onboarding exposed, and the post-onboarding checklist that closes them.