Microsoft 365 can feel like an all-inclusive resort. Breakfast, amenities, activities—no reason to leave the villa. Except, instead of a vacation retreat, it’s a platform that covers everything from email and file storage to team communication.
It’s easy to then grow lax, thinking that security is taken care of too. But relying on default security settings can have disastrous consequences. It raises the all-important question: is Microsoft 365 security strong enough to actually protect your business?
The honest answer is: it depends. A managed services provider (MSP) can help you adjust the default Microsoft 365 security settings and provide ongoing cybersecurity support for your business. Here’s how.
How to Tell if Microsoft 365 Is Secure “Enough”
Microsoft 365 is built on an enterprise-grade security platform. It includes tools like Microsoft Entra ID with multi-factor authentication (MFA), Microsoft Defender for Office 365, Data Loss Prevention (DLP) policies, encryption, Microsoft Purview for compliance, and Microsoft Secure Score to measure and improve your overall security posture.
Sounds secure, right? The problem isn’t the reliability of these features; it’s that many aren’t enforced by default. It’s that gap between what’s available and what’s actually configured that creates the vulnerabilities.
What You Need to Know About the Shared Responsibility Model
Microsoft secures the underlying cloud infrastructure and the actual platform itself. That’s it. It’s your responsibility to secure everything else: your data, user identities, access controls, configurations, etc.
This is called the Shared Responsibility Model, and it’s the misunderstanding of it that catches most businesses out. Assuming “Microsoft handles our security” without putting any further thought into it leaves dangerous gaps that attackers actively look for and exploit.
Microsoft 365’s Built-In Security Features
So, what security features does Microsoft 365 actually include? The built-in features are:
- Microsoft Entra ID with MFA and Conditional Access
- Microsoft Defender for Office 365, which offers email and threat protection
- DLP policies for sensitive data protection
- Encryption for data in transit and at rest
- Microsoft Purview for compliance and governance
- Microsoft Secure Score to assess your security posture
Where Microsoft 365 Security Falls Short by Default
Here’s why default settings often don’t offer the security you think they will:
- MFA and Conditional Access aren’t always enforced automatically
- Permissions and sharing settings are easy to misconfigure
- Lower licensing tiers lack the Microsoft 365 security features found in Business Premium or E5
- Retention policies are not the same thing as a true backup. You’ll still be at risk from Ransomware or accidental deletion
- There’s no built-in monitoring or incident response unless you put it there yourself
Microsoft 365’s Vulnerabilities
Microsoft 365 is not a foolproof, all-in-one security solution. Cybercriminals actively probe for gaps in its defenses, making it a frequent target for attacks that exploit specific vulnerabilities like:
- Phishing and business email compromise
- Credential theft and account takeover
- Ransomware through email or shared files
- Human error and accidental oversharing of sensitive data
- Risky third-party app connections
These are a daily reality for businesses of every size. That’s why the proper configuration of Microsoft 365 security is fundamental to creating a fully secure environment for your organization.
The Backup Myth: Microsoft Doesn’t Fully Back Up Your Data
“My data is stored in the cloud. That means it’s safe, right?” Unfortunately, this isn’t always the case. Microsoft’s retention policies are designed for compliance—they aren’t an infallible data backup solution.
If you plan to rely on Microsoft 365 security for your backup needs, your data is still at risk of permanent loss through accidental deletion, ransomware, departing employees, or malicious action. A dedicated third-party backup solution is usually recommended for genuine protection and fast recovery.
Is Microsoft 365 Secure Enough for MY Business?
The answer depends on three things:
- Your industry and compliance obligations: Healthcare organizations subject to HIPAA, financial firms, and other regulated industries have stricter requirements than those offered by the default Microsoft 365 security settings.
- Your licensing and configuration: The Business Basic and Business Premium plans offer different levels of protection, and the configuration of each plays a significant role in their effectiveness.
- Your team’s security awareness: Technical controls only go so far. Untrained employees remain one of the biggest risks in any organization.
What Settings Should I Change to Strengthen Microsoft 365’s Security
Build your Microsoft 365 security layer by layer. Start by:
- Enforcing MFA and Conditional Access across every user account
- Matching your licensing to your actual security needs
- Configuring DLP and data protection policies correctly
- Adding continuous monitoring and a defined incident response plan
- Investing in ongoing security awareness training for your team
- Implementing a third-party backup and recovery solution
- Running regular security assessments and tracking your Secure Score
- Partnering with a managed IT provider so everything is maintained proactively
Strengthen Your Microsoft 365 Security With OnboardIT
Been meaning to assess your security posture in your Microsoft 365 environment for a while? OnboardIT can help. We work with businesses across Arizona to configure and maintain Microsoft 365 security in a way that perfectly fits your business’s needs. That includes layered cybersecurity, backup and recovery, security awareness training, and proactive monitoring.
Most businesses use less than 20% of what their Microsoft 365 licensing actually provides. With OnboardIT, you get the full value of your Microsoft 365 investment—configured securely and maintained proactively—no guesswork, and no relying on default settings.
Book a free consultation with OnboardIT
