The Top 10 M365 Security Best Practices for MSPs

As an MSP, securing your clients’ M365 environments is one of the most critical aspects of your service offering. With cyber threats on the rise, proactive security measures are essential to keep client data safe and build trust. Here are the top M365 security best practices to help you enhance protection, ensure compliance, and stay ahead of emerging threats.

1. Enforce Multi-Factor Authentication (MFA)

Multi-Factor Authentication is one of the most effective and straightforward ways to protect user accounts. A study from Cornell University found that enforcing MFA can prevent up to 99% of account compromise attacks. Set it up as a baseline security requirement for all users, regardless of their access level, and regularly audit MFA usage to ensure ongoing compliance.

• Tip: Consider using Augmentt MFA to streamline the management of MFA settings across multiple tenants, ensuring consistency and efficiency.

2. Implement Conditional Access Policies

Conditional Access Policies provide an additional layer of control by requiring specific conditions to be met before granting access. This may include device compliance, geographic location, or user risk. Set up policies that enforce location-based restrictions and block access from risky locations or unknown devices.

• Best Practice: Develop specific policies for high-risk scenarios, like requiring MFA for logins from outside the client’s typical region, to provide targeted security where it’s needed most.

3. Secure Email with Anti-Phishing and Anti-Spam Protections

Phishing remains one of the most prevalent and dangerous threats in M365 environments. Use Microsoft Defender for Office 365 to activate anti-phishing, anti-spam, and anti-malware protections. Configure these tools to identify and block high-risk emails, minimizing the chance of a successful phishing attack.

• Advanced Security Tip: Use Safe Links and Safe Attachments policies to protect users from harmful links or attachments, even in real-time. Ensure these settings are tuned to minimize false positives while maximizing threat detection.

4. Regularly Review User Access and Permissions

Access creep, where users retain access to resources they no longer need, can create security risks. Regularly review and audit user permissions to ensure only authorized individuals have access to sensitive information.

• Recommendation: Set up a quarterly or bi-annual permissions review process to check access levels across all M365 services, including SharePoint, Teams, and OneDrive.

5. Enable Data Loss Prevention (DLP) Policies

Data Loss Prevention policies can help you monitor and protect sensitive information from accidental or intentional leakage. In M365, DLP policies can identify, monitor, and protect sensitive data (e.g., financial records, health information) by restricting sharing or alerting administrators to potential data breaches.

• Pro Tip: Customize DLP policies to meet client-specific compliance requirements and ensure that sensitive data stays secure. Use auditing tools to monitor DLP actions and refine policies as needed.

6. Set Up Secure Mobile Device Management (MDM)

Many users access M365 from personal and mobile devices, which can introduce security vulnerabilities. Use Intune, Microsoft’s Mobile Device Management solution, to enforce policies that require encryption, passcodes, and other protections on any device that accesses M365 resources.

• Best Practice: Encourage clients to use Mobile Application Management (MAM) policies, which protect M365 data on mobile devices without affecting personal data, offering a balanced approach to security.

7. Utilize Microsoft Secure Score for Ongoing Security Improvements

Microsoft Secure Score is a dynamic report within M365 that provides a security rating based on the configurations and practices across M365 services. Use this tool as a benchmarking and tracking resource to understand your security posture and identify areas of improvement.

• Pro Tip: Regularly monitor Secure Score and implement recommended actions to strengthen security while keeping track of changes over time.

8. Conduct Regular Security Awareness Training

User awareness is a key component of a robust security strategy. Equip your clients’ employees with knowledge about phishing, ransomware, and other cyber threats through regular security training. Make sure users understand the role they play in protecting their accounts and sensitive data.

• Advanced Tip: Consider simulating phishing attacks and tracking the results to assess the effectiveness of your training and identify users who may need additional guidance.

9. Enable Auditing and Alerting for Suspicious Activity

Proactively monitoring your M365 environment for suspicious activities, such as failed login attempts or unusual file access patterns, can help detect potential security incidents early. Configure alerting and logging for key security events and review audit logs to track abnormal behavior.

• Suggestion: Set up alerts for high-risk activities, like administrative changes or large data downloads, to catch potential breaches as they occur. Learn more about how Augmentt’s Alerts work.

10. Regularly Update and Patch M365 Apps

Ensure that all M365 apps are updated regularly to receive the latest security patches. Microsoft frequently releases updates that address vulnerabilities in its apps, so keeping client environments current minimizes the risk of known threats.

• Automate Updates: Where possible, automate the update process to reduce the risk of vulnerabilities caused by outdated software.

Be Proactive to Stay Secure

MSPs play a crucial role in securing clients’ Microsoft 365 environments, and by implementing these best practices, you can significantly reduce security risks. The best security strategy is one that’s consistently applied and regularly reviewed, so make sure to revisit these steps and adjust as threats evolve.

Start enhancing your clients’ M365 security today with these proactive strategies—and see why so many MSPs trust award-winning solutions like Augmentt to help them safeguard their clients’ environments with confidence.