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Microsoft 365 Shared Responsibility Model means Microsoft will secure the cloud infrastructure, and you will protect the data in the cloud.
Think of it, Microsoft as your apartment landlord and yourself as the tenant. Like every responsible landlord, they are responsible for:
- Building’s physical well-being,
- Power and plumbing,
- And ensuring that the master door on the front works.
On the flip side, like any tenant in the world, you’re responsible for your essentials (furniture, appliances, etc.) in that apartment. And this is called the Shared Responsibility Model.
So, if your organization heavily relies on Microsoft 365 (M365), you should not miss this blog post at any cost! It will explain what the Microsoft Office 365 Shared Responsibility model is, its hidden gaps, and the impact of Copilot.
Stay tuned till the end!
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MS 365 Shared Responsibility: What You Need to Protect vs. What Microsoft Secures
Most Microsoft Office 365 users believe that Microsoft is fully responsible for protecting, backing up, and managing their data. However, it’s a half-truth, and it might not be wrong to say that it is a dangerously flawed assumption.
And, as a growing enterprise that just started using Office 365 productivity tools, it is imperative to understand where Microsoft’s duties end and yours begin. It will help you majorly in developing a foolproof cloud strategy.
So, explore the given table, classifying Microsoft duties and your duties separately. It will help you understand your Microsoft 365 Shared Responsibility Model duties better.
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Retention vs. Backup: The Biggest Responsibility Gap
Do you know what the most overlooked responsibility gap is between Microsoft and organizations? Confusing data replication with data backup.
Suppose a physical server center fails, Microsoft will smoothly spin up your data instantly in one of its other data centers. It assures service availability. It’s an undeniable fact that Microsoft is great at data replication.
However, for tenant- security levels issues like data corruption, accidental deletion, or negative intent, it gives you full ownership. In other words, you’re responsible for data security.
Even the Microsoft Service agreement clearly states: “We recommend that you regularly back up your content and data that you store on the services or store using third-party apps and services.
Here are some Microsoft 365 Office data retention limitations
- Your deleted items in OneDrive and SharePoint are permanently removed after 93 days.
- By default, your deleted emails will no longer be available after 14 to 30 days.
- Using compliance holds as a backup move doesn’t protect you from ransomware that encrypts the entire environment. So, if a compromised credential or a rogue admin deletes your tenant, the hold will disappear.
Copilot and Sophisticated Credential Attacks
IT admins and high-level employees need to acknowledge the following factors:
- Microsoft 365 Copilot Sharing Sensitive Data
You might know that over 70% of the Fortune 500 companies are deploying Microsoft 365 Copilot. This GenAI tool respects user permissions, but flooded forums tell a different story altogether.
IT admins have reported that Copilot is surfacing sensitive information to unauthorized employees via simple prompts. So, if your internal data is messy or low-level employees have read access to confidential financial data, you’re on the verge of huge risk.
And as per the Microsoft 365 Shared Responsibility model, data governance absolutely falls under your responsibility area.
- Sophisticated Credential Attacks (Phishing and Session-Hijacking)
You are required to understand that the Office 365 Shared Responsibility Model is not static; it develops alongside technology. And as technology takes a step forward, cyber risks mimic the same.
About the above, notorious threat groups like Forest Blizzard (APT28) use sophisticated phishing and season-hijacking techniques to target the M365 environment.
But why credential attacks? Because your identity perimeter is the main gateway to your data. Hence, if you fail to enforce strong conditional access policies, you’re just one bad day away from losing your valuable data.
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How to Close the Microsoft 365 Shared Responsibility Gaps? 4 Easy Steps
Here are the 4 easy steps to close the Microsoft Office 365 Shared Responsibility more effectively:
Step 1: Employ a Third-Party Backup
Use a dedicated, cloud-to-cloud backup solution. The respective tool must store point-in-time, encrypted data independently of your main Microsoft tenant.
And since we are discussing how to close the Microsoft Shared Responsibility gap and data protection, always choose a trusted, ISO-certified backup tool like SysTools Office 365 Backup & Restore Tool.
Step 2: Configure Advanced Multi-Factor Authentication
Implementing phishing-resistant MFA for all accounts can safeguard your organization from modern credential threats. So, install conditional access rules and hardware-based/ authenticator-app-driven MFA enterprise-wide.
Step 3: Routinely Review External Sharing Permissions
Auditing external sharing permission quarterly can prove an effective practice to close the Shared Responsibility gap. Proactively review who can access your SharePoint sites and OneDrive folders. It will prevent creeping over-privilege.
Step 4: Set up Microsoft Purview Information Protection
As an IT admin, you can also activate Microsoft Pureview Information Protection. It automatically classifies and encrypts files containing sensitive info. Even if your data is downloaded to an unmanaged endpoint, it will be safe.
Author’s Final Words
Microsoft 365 Shared Responsibility Model is about drawing a boundary line between Microsoft and users. It is about sharing duties to secure the Cloud environment.
Trending Right Now: Microsoft 365 End-of-Support Guide for 2026 & Beyond
FAQs (Frequently Asked Questions)
Q.1 What is the Microsoft 365 Shared Responsibility Model?
Microsoft 365 Shared Responsibility model refers to the unified collaboration of Microsoft and the businesses to protect different security layers. This model ensures that the cloud infrastructure and data stored in the cloud remain safe.
Q.2 How to use the Microsoft 365 Shared Responsibility Model?
Here’s how you can use the Microsoft 365 shared Responsibility Model in your organization:
- Implement third-party data backup
- Impose Multi-Factor Authentication (MFA) enterprise-wide
- Configure Data Loss Prevention (DLP) Policies.
- Apply Mobile Device Management (MDM) and Mobile Application Management (MAM) via Intune
- Maintain compliance evidence packs (logs, MFA reports, and backup results).
Q.3 Who is responsible for Copilot surface sensitive data from unauthorized data?
As per O365 Shared Responsibility, data governance is a 100% customer problem. Make sure that your internal data is configured properly, including that unauthorized employees don’t have access.
Q.4 Does Microsoft protect from data corruption?
No, Microsoft doesn’t protect your business from data corruption. It advises you to use a third-party tool to back up your data.
Q.5 An organization has deployed Microsoft 365 applications to all employees. Considering the shared responsibility model, who is responsible for the accounts and identities relating to these employees?
The organization is responsible for the accounts and identities of these employees. Microsoft gives full ownership of identity access controls (user privileges, role-based access controls).
