Is Microsoft 365 Secure Enough on Its Own?

Microsoft 365 has become the backbone of daily operations for businesses of nearly every size. Employees use Outlook to communicate, Teams to collaborate, SharePoint to manage information, and OneDrive to store important company files.

With so much business activity happening inside one ecosystem, an important question comes up: Is Microsoft 365 secure enough on its own?

Microsoft provides businesses with a strong security foundation, particularly when Microsoft 365 is configured correctly. However, relying exclusively on the security included with Microsoft 365 may leave gaps depending on your licensing, configuration, users, and overall risk profile.

For many organizations, the better strategy is layered security. That means combining Microsoft’s built-in protections with additional tools such as Proofpoint, independent backups, endpoint security, employee security training, and proactive monitoring.

As Jeff Wolverton, CEO of PivIT Strategy, explains:

“Microsoft 365 gives businesses a great security foundation, but cybersecurity should never depend on one layer of protection. We want multiple opportunities to stop an attack. If something gets through one layer, there should be another security control waiting behind it.”
Jeff Wolverton, CEO, PivIT Strategy

Microsoft 365 Al ready Includes Important Security Features

Microsoft 365 should not be confused with an inherently insecure platform. In fact, moving business email and collaboration systems into a professionally managed cloud platform can provide significant security benefits.

The Cybersecurity and Infrastructure Security Agency (CISA) has encouraged small and medium-sized businesses to move away from maintaining their own on-premises email and file-storage infrastructure and toward secure cloud services such as Microsoft 365.

Depending on your Microsoft licensing and configuration, organizations can have access to protections involving identity, email, devices, applications, data, and user access.

One of the most important is multifactor authentication.

CISA recommends businesses require MFA wherever possible, particularly for email, file storage, remote access, administrative accounts, and employees handling sensitive information. CISA also recommends moving toward phishing-resistant MFA methods when possible.

These protections can make Microsoft 365 considerably more difficult for attackers to compromise.

The problem is that having security features available is not the same as having a complete cybersecurity strategy.

Why Microsoft 365 Security Should Be Layered

Think about cybersecurity like protecting a physical building.

You probably would not protect an office with only a lock on the front door. You might have locks, access controls, cameras, an alarm system, fire detection, backups, and procedures employees follow during an emergency.

Cybersecurity works similarly.

If an attacker gets past one security measure, another should ideally stop or detect the attack.

This concept becomes particularly important with email because attackers increasingly target employees instead of attacking infrastructure directly.

The National Institute of Standards and Technology (NIST) warns that phishing attacks can use convincing messages that appear to come from trusted organizations or even leaders within a victim’s own business. NIST recommends a combination of employee education, email filtering, antivirus protection, and email authentication technologies to reduce phishing risk.

That is where adding specialized security technologies to Microsoft 365 can become valuable.

Adding Proofpoint to Microsoft 365

One example is Proofpoint, an email security platform that can complement Microsoft 365.

Microsoft provides native email-security capabilities, but organizations can add Proofpoint as another layer specifically focused on protecting users and email.

Proofpoint’s Microsoft 365 security offerings are designed to provide additional protection against threats including phishing, business email compromise, ransomware, malicious links, malware, and compromised accounts.

Why add another email-security layer?

Because attackers are constantly changing their techniques.

A traditional phishing email might contain an obviously malicious attachment. Modern attacks can be much more subtle. An attacker might impersonate an executive, compromise a legitimate vendor account, send a fake invoice, use a QR code, or direct an employee toward a convincing Microsoft login page.

Proofpoint can analyze email for suspicious characteristics and help prevent potentially malicious messages from reaching employees in the first place.

It can also provide protections at different stages of an email’s lifecycle, including pre-delivery filtering, click-time protection, and post-delivery remediation.

The goal is not to replace Microsoft 365. It is to add another layer around an environment your business already depends on.

Email Security Is Only One Layer

Even adding advanced email security does not create a complete cybersecurity strategy.

Businesses should think about several layers surrounding Microsoft 365.

Multifactor Authentication

Passwords alone are not enough.

If an employee accidentally enters a password into a fake Microsoft login page, MFA can provide an additional barrier between the attacker and the account.

CISA specifically notes that MFA can protect an account even when a password has been compromised and recommends stronger, phishing-resistant authentication methods where possible.

Endpoint Protection

Microsoft 365 security cannot eliminate every threat that reaches a laptop, desktop, or mobile device.

Endpoint detection and response tools can monitor devices for suspicious activity, malware, ransomware, and other indicators of compromise.

This provides another opportunity to identify malicious activity even if an attacker successfully gets past an earlier defense.

Independent Microsoft 365 Backups

Another important consideration is backup and recovery.

Microsoft provides resilience and recovery capabilities within its cloud ecosystem, but businesses should evaluate whether those capabilities meet their own retention, recovery, compliance, and business continuity requirements.

A dedicated Microsoft 365 backup solution can provide another copy of important Exchange, OneDrive, SharePoint, and Teams data depending on the solution being used.

CISA includes backing up business data among its recommended next-level cybersecurity practices for small and medium-sized businesses.

Security Awareness Training

Technology cannot completely remove the human element from cybersecurity.

Employees receive emails, approve login requests, download files, communicate with vendors, and handle sensitive information every day.

Security awareness training can teach employees how to recognize suspicious login pages, unexpected MFA requests, fraudulent invoices, impersonation attempts, and phishing emails.

That training becomes another layer.

Monitoring and Managed IT Support

Finally, someone needs to manage the entire environment.

Security tools are only useful when they are configured correctly, monitored, maintained, and acted upon.

Businesses should regularly review user accounts, administrative privileges, security alerts, device compliance, MFA configurations, email-security policies, and other Microsoft 365 settings.

This is one of the biggest advantages of working with a managed IT services provider. Instead of purchasing security products and hoping they are configured correctly, businesses can build a coordinated security strategy around their actual environment.

Microsoft 365 Security Is About More Than Microsoft 365

So, is Microsoft 365 secure enough on its own?

For most businesses, that is not the most useful way to frame the question.

Microsoft 365 can provide an excellent security foundation. The better question is whether your entire IT environment has enough layers to protect your users, devices, email, applications, and data.

A business might combine Microsoft 365 security features with Proofpoint email protection, MFA, endpoint detection, independent backups, employee training, and continuous monitoring.

Each layer has a different job.

The objective is that when one security measure fails, another has an opportunity to detect or stop the threat.

Strengthen Your Microsoft 365 Security with PivIT Strategy

Microsoft 365 is incredibly powerful, but simply purchasing licenses does not automatically create a secure IT environment.

Configuration matters. Monitoring matters. Employee behavior matters. And the additional security technologies surrounding Microsoft 365 matter.

PivIT Strategy helps businesses evaluate their Microsoft 365 environments, identify potential security gaps, implement additional cybersecurity protections, and manage those systems over time.

Whether that means strengthening Microsoft 365 configurations, implementing MFA, adding Proofpoint email security, improving endpoint protection, establishing backups, or creating a broader cybersecurity strategy, the goal is the same: build multiple layers between your business and an attacker.

If you are unsure whether your current Microsoft 365 environment provides the protection your organization needs, contact PivIT Strategy to review your existing security setup and determine where additional protection may make sense.