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EARLY ACCESS
Chapter 1 arrives late October 2026

Get Early Access to the New O’Reilly Report on Tenant Resilience

This new O'Reilly report, sponsored by CoreView, provides IT and security leaders with a tenant-level framework for understanding and reducing Microsoft 365 risk.

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Microsoft 365 Tenant Resilience
A Practical Leadership Framework for Reducing Blast Radius and Restoring Trusted Operations
Simon Bisson
CHAPTER
1
early release
Chapter 1
Late October 2026
Chapter 2
November 2026
The full book
February 2027

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Topics ahead include privilege, configuration drift, SharePoint exposure, recovery and AI readiness.

1
FIRST RELEASE
Late October 2026
Understand Why Microsoft 365 Has Become a Business Control Plane
COMING NEXT
November 2026
Learn to Assess Where Blast Radius Is Too Large in Your Tenant
COMPLETE REPORT
February 2027
Get the full O'Reilly book, straight to your inbox
EARLY RELEASE · CHAPTER
01
Microsoft 365 Has Become a Business Control Plane
Arrives late October 2026
INSIDE CHAPTER 1

What you'll learn first

This first early-release chapter will help you understand:

Why Microsoft 365 has evolved from a productivity suite into a business-critical operating environment, and why that dependence concentrates risk.
Why hidden tenant risk is easy to miss when security and admin views stay fragmented.
Why leaders need to assess Microsoft 365 through three concepts: control-plane risk, blast radius and trusted-tenant state.
How this lens sets up the deeper look at privilege, configuration drift, SharePoint exposure, recovery and AI readiness later in the report.
Sign Up to Reserve Chapter 1

Your business runs on Microsoft 365.
Can you vouch for the tenant behind it?

Microsoft 365 shapes who can access information, how collaboration is governed, how changes get made, and how quickly teams can recover. But often identity, SharePoint, configuration, security, backup, and AI readiness are managed separately.

This creates blind spots, where excessive access, misconfigurations, security gaps, and recovery risks can go unnoticed until they become a problem.

Chapter 1 reveals why true tenant resilience depends onviewing these risks together.

54%
of self-rated mature organizations are still missing a foundational identity or configuration control. This shows how easily confidence can outrun control.
Source: CoreView 2026 State of Microsoft 365 Security Report
WRITTEN FOR

IT and Security Leaders responsible for Microsoft 365 resilience across teams

Whether you oversee your organization’s entire Microsoft 365 tenant or just part of it, resilience depends on understanding how identity, configuration, SharePoint, AI readiness, and recovery planning work together.

Yet responsibility for these areas is often fragmented across teams, which can mean that gaps between them remain hidden. Without a tenant-wide view, it’s harder to know where your biggest exposures lie, how one weakness could amplify another, or what needs attention first.

This report helps you see those risks in context, identify your biggest exposures, and prioritize action.

ABOUT THE AUTHOR
Headshot image of Simon Bisson the author of the book
Simon Bisson

Simon Bisson is a respected technology journalist and analyst who has spent decades covering enterprise IT, cloud platforms, software development, and Microsoft’s business technology ecosystem. His writing is valued for translating complex platform shifts into clear, practical insight for technology leaders and practitioners.

Published by O'Reilly. O'Reilly reaches technology leaders through a trusted learning platform used by 2.8M+ members and 5K+ enterprise clients, backed by 45+ years of technology expertise.

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Chapter 1 arrives late October 2026.

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Chapter 1 arrives late October
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