9 Easy and Smart Ways to Enhance Security with Microsoft 365 Business Premium

Microsoft 365 Business Premium remains one of the strongest security bundles for small and midsize businesses in 2026. It combines productivity apps, cloud identity, device management, email protection, endpoint security, and information protection in one subscription—provided it is configured correctly.

1. Start with the right Microsoft 365 plan and licensing model

The old description of Microsoft 365 Business as Office 365 Business Premium plus Windows 10 and EMS is outdated. Today, the security-focused SMB plan is Microsoft 365 Business Premium. It includes Microsoft 365 Apps for business, Exchange Online, SharePoint, OneDrive, Teams, Windows 11 Business upgrade rights for eligible Windows Pro devices, Microsoft Entra ID P1, Microsoft Intune, Microsoft Defender for Business, and Microsoft Defender for Office 365 Plan 1. It is different from Business Basic and Business Standard, which do not include the same security stack. It is also different from Microsoft 365 E3/E5, which may be a better fit for larger organizations or those needing advanced compliance, Microsoft Defender XDR capabilities, Entra ID P2, or Microsoft Purview premium features. If you buy through CSP, review your New Commerce Experience terms, monthly or annual commitment, seat-change rules, and add-on needs before you standardize.

2. Protect identities with Microsoft Entra ID

Most security incidents still begin with identity compromise, so identity protection should come first. Microsoft 365 Business Premium includes Microsoft Entra ID P1, which enables Conditional Access, stronger access controls, and integration with device compliance. At a minimum, organizations should enforce multifactor authentication, block legacy authentication, use least-privilege admin roles, require compliant devices for sensitive access, and consider passwordless sign-in methods such as Microsoft Authenticator, FIDO2 security keys, or Windows Hello for Business. Security Defaults can help very small tenants get basic protections quickly, while Conditional Access gives more control as requirements grow.

3. Stop phishing and malicious email with Microsoft Defender for Office 365

Office 365 Advanced Threat Protection is now Microsoft Defender for Office 365. In Microsoft 365 Business Premium, Defender for Office 365 Plan 1 helps protect users from phishing, spoofing, malicious links, and unsafe attachments. Key capabilities include anti-phishing policies, impersonation protection, spoof intelligence, Safe Links, Safe Attachments, quarantine policies, tenant allow/block lists, and preset security policies. For many SMBs, Microsoft’s Standard and Strict preset security policies are a practical way to start with stronger email protection without building every rule manually. Organizations that need advanced hunting, attack simulation training, automated investigation and response, or richer post-breach analysis may need Defender for Office 365 Plan 2 or a higher Microsoft 365 plan.

4. Encrypt sensitive messages with Microsoft Purview Message Encryption

Email encryption has also evolved. Microsoft Purview Message Encryption helps users send protected messages to internal and external recipients, including people using non-Microsoft mail systems. Encryption can be applied directly by users or through policies, and sensitivity labels can apply encryption and usage restrictions such as preventing forwarding or limiting access to specific groups. For best results, message encryption should be part of a broader information protection design, not a one-off setting.

5. Classify and protect business data with Microsoft Purview Information Protection

Azure Information Protection terminology has largely been replaced by Microsoft Purview Information Protection. Sensitivity labels allow organizations to classify content such as Public, General, Confidential, or Highly Confidential, and then apply protection such as encryption, marking, and access restrictions. Labels can work across Microsoft 365 apps and services including Office apps, SharePoint, OneDrive, Teams, and Exchange. Some advanced capabilities, such as more sophisticated auto-labeling or premium compliance workflows, may require additional Microsoft Purview licensing beyond Business Premium.

6. Reduce accidental data exposure with Microsoft Purview Data Loss Prevention

Microsoft Purview Data Loss Prevention helps detect and prevent inappropriate sharing of sensitive information such as personal data, financial information, health records, or custom business identifiers. DLP policies can apply to locations such as Exchange, SharePoint, OneDrive, Teams, and supported endpoint scenarios depending on licensing and configuration. Good DLP programs start with a small number of high-value policies, user-friendly policy tips, testing in audit mode, and gradual enforcement. The goal is to reduce risky sharing without blocking normal business work.

7. Use archiving and retention correctly—and do not confuse them with backup

Exchange Online Archiving, retention policies, litigation hold, and eDiscovery are compliance and data lifecycle tools. They help organizations retain, discover, and manage mailbox content for legal, regulatory, or operational reasons. They are not the same as a point-in-time backup. If you need recovery from accidental deletion, ransomware, administrative mistakes, or broad data corruption, evaluate Microsoft 365 Backup or a trusted third-party backup service in addition to retention and archiving. A mature Microsoft 365 data strategy should define what must be retained, what can be deleted, how long data is kept, and how recovery will work.

8. Manage devices and apps with Microsoft Intune

Microsoft Intune helps secure company-owned and personal devices by managing enrollment, compliance policies, configuration profiles, app protection policies, and mobile application management. It supports Windows, macOS, iOS/iPadOS, and Android scenarios. For Windows endpoints, Intune can help deploy security baselines, BitLocker settings, Microsoft Defender configurations, attack surface reduction rules, update policies, and Windows Autopilot provisioning. When Intune compliance is combined with Microsoft Entra Conditional Access, you can require that only healthy, compliant devices access company resources.

9. Protect endpoints and monitor posture with Defender for Business and Secure Score

Windows Defender ATP is now part of the Microsoft Defender family. For Microsoft 365 Business Premium customers, the SMB endpoint security product is Microsoft Defender for Business. It provides next-generation protection, endpoint detection and response, automated investigation and remediation, attack surface reduction, ransomware protection, and vulnerability management basics for supported devices. Microsoft Secure Score, available through the Microsoft Defender portal, helps measure and improve security posture across identities, devices, email, apps, and data. The Microsoft Defender portal also brings alerts and incidents into a more unified experience, and organizations with broader licensing can extend this into Microsoft Defender XDR across more workloads.

Key takeaways

• Microsoft 365 Business Premium is the modern security-focused Microsoft 365 plan for many SMBs, but it must be configured—not just purchased.
• Current terminology matters: Azure AD is Microsoft Entra ID, Office 365 ATP is Microsoft Defender for Office 365, Windows Defender ATP is Microsoft Defender for Endpoint/Defender for Business, and Azure Information Protection is now part of Microsoft Purview Information Protection.
• Identity security, MFA, Conditional Access, device compliance, and least-privilege administration should be treated as baseline controls.
• Archiving, retention, and eDiscovery are not the same as backup; use Microsoft 365 Backup or a partner backup solution when point-in-time recovery is required.
• Microsoft Secure Score and the Microsoft Defender portal are useful starting points for prioritizing improvements, but a practical security roadmap should align controls with business risk and licensing.

If you want to get more value from Microsoft 365 Business Premium, IT Partner can help assess your tenant, configure a practical SMB security baseline, review CSP/NCE licensing, and deploy services such as Microsoft Defender, Microsoft Intune, Microsoft Entra ID, Microsoft Purview, and Microsoft 365 Backup.