Can You Add Enterprise Mobility + Security E5 to Microsoft 365 Business Premium?
Question details
The user wants to know if they can purchase and apply the Enterprise Mobility + Security (EMS) E5 add-on to an existing Microsoft 365 Business Premium subscription.

- Product
- Microsoft 365
- Device & OS
- not provided
- Scenario
- Evaluating advanced security licensing options and add-on compatibility for a business environment.
- Observed behavior
- Looking for clarification on purchasing eligibility, as EMS E5 is not showing as an available add-on for Microsoft 365 Business Premium.
Verify your current Microsoft 365 subscription type and ensure you have global administrator access in the Microsoft 365 Admin Center before evaluating new licenses.
Upgrade to a Microsoft 365 Enterprise Plan
Since EMS E5 is generally incompatible as an add-on for Business Premium, you will need to transition the required users to an Enterprise plan.
Microsoft 365 Business Premium is designed for small to medium-sized businesses with a cap of 300 users and includes its own tailored set of security features. Because of this, it is not generally eligible for Enterprise Mobility + Security (EMS) E3 or E5 add-ons.
To utilize the advanced features of EMS E5, you must associate it with a Microsoft 365 Enterprise licensing tier. You can mix licenses in your tenant, meaning you only need to upgrade the specific users who require EMS E5 capabilities to an Enterprise plan.
Log in to the Microsoft 365 Admin Center using your global administrator credentials.
In the left-hand navigation menu, click on 'Billing' and then select 'Purchase services'.
Search for Microsoft 365 Enterprise plans (such as Office 365 E3/E5 or Microsoft 365 E3/E5) that natively support or include the EMS E5 features.
Complete the checkout process for the new Enterprise licenses, then navigate to 'Users' > 'Active users' to assign the new licenses to the appropriate staff members.

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Frequently Asked Questions
Can I mix Business Premium and Enterprise licenses in the same tenant?
Yes, Microsoft allows you to mix different license types within the same tenant. You can keep some users on Microsoft 365 Business Premium while upgrading others to a Microsoft 365 Enterprise plan to utilize EMS E5.
What is the maximum user limit for Microsoft 365 Business Premium?
Microsoft 365 Business Premium is limited to a maximum of 300 seats per organization. If your organization grows beyond this limit, you must transition to Microsoft 365 Enterprise plans regardless of your EMS requirements.
What features does Enterprise Mobility + Security E5 include?
EMS E5 provides advanced enterprise security features, including Microsoft Entra ID P2 (formerly Azure AD Premium P2), Microsoft Defender for Cloud Apps, advanced information protection, and risk-based conditional access policies.




