The Myth of Coverage: Why Layered Security Doesn’t Mean Protected

More Tools ≠ More Protection

Microsoft 365 gives you MFA, SSO, Conditional Access, Defender, Purview, and Intune.

But tools don’t make you secure. Configuration does.

What We Find in Full Stack Reviews

Despite full licensing, we routinely discover:

• Unused Defender configurations

• Conditional Access gaps

• Intune drift and unenforced policies

• Purview DLP with partial coverage

• Guest access with no expiry logic

In other words -tools without traction.

The Illusion of Layering

Layered security only works if each layer:

• Is configured properly

• Communicates with the others

• Has a policy logic that aligns

Most environments have overlap, not cohesion.

Secure Score ≠ Secure Posture

Your dashboards might show a “pass,” but do they reflect:

• Guest lifecycle enforcement?

• Device wipe testing?

• Real-world Conditional Access simulation?

If not, coverage is theoretical.

Cornerstone’s Full Stack Health Check benchmarks across identity, device, and data -

so you can validate, not guess.

Let’s move from assumed to assured.