License & Subscription Issues

Do Microsoft 365 E3 Licenses Include Exchange Server CAL Rights?

Maira Mehtab Sep 22, 2026 869 views

Question details

Organizations planning to deploy Exchange Server on-premises need to clarify if their existing Microsoft 365 E3 licenses cover Exchange Server Client Access Licenses (CALs) and server licenses.

Product: Microsoft 365 E3
Device & OS: not provided
Scenario: Deploying Exchange Server on-premises for organizations utilizing Microsoft 365 E3 users.
Observed behavior: Unclear licensing requirements regarding the necessity of purchasing separate Exchange Server licenses and CALs for on-premises deployments.

Before you start

Gather your Microsoft licensing agreements (such as an Enterprise Agreement) and consult your Microsoft account representative to review your specific subscription entitlements.

Solution 1Recommended

Verify EA/EAS Entitlements for Exchange Server Rights

Determine if your Microsoft 365 E3 licenses were purchased through a channel that includes on-premises access rights.

Microsoft's licensing guidance states that Microsoft 365 E3 and E5 User Subscription Licenses (USLs) purchased via an Enterprise Agreement (EA) or Enterprise Subscription Agreement (EAS) often include rights to access and install Exchange Server on-premises.

However, this is highly dependent on your specific contract terms. Even if your subscription includes Client Access License (CAL) rights, a separate server license for the physical or virtual environment might still be required.

Check your licensing channel

Review your purchasing agreement documentation to confirm if your Microsoft 365 E3 licenses were bought through an Enterprise Agreement (EA) or Enterprise Subscription Agreement (EAS).

Review the Microsoft Product Terms

Navigate to the official Microsoft Product Terms website to check the dual use rights associated with your specific Microsoft 365 E3 subscription tier.

Consult a licensing specialist

Reach out to your dedicated Microsoft account manager or a certified Microsoft licensing partner to officially validate your entitlements before initiating the Exchange Server deployment.

Understanding Dual Use Rights: Dual Use Rights allow users licensed for specific cloud services to access equivalent on-premises servers, but the server software installation itself generally requires a separate dedicated license.

Solution 2

Purchase Separate Exchange Server Licenses and CALs

If your Microsoft 365 E3 licenses do not include on-premises rights, you must buy them separately.

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Frequently Asked Questions

What are Microsoft Dual Use Rights?

Dual Use Rights are licensing benefits included with certain Microsoft cloud subscriptions (like Microsoft 365 E3 purchased via EA/EAS). They allow users to access corresponding on-premises server software without needing to purchase separate Client Access Licenses (CALs).

Do I need to buy an Exchange Server license if I have Microsoft 365 E3?

Yes. In most cases, even if your Microsoft 365 E3 licenses include CAL rights for your users to access an on-premises server, you still need to purchase the actual Exchange Server software license for the server hardware you are deploying.

Are Exchange CALs included if I buy Microsoft 365 E3 through the CSP program?

Generally, no. Microsoft 365 E3 licenses purchased through the Cloud Solution Provider (CSP) program do not typically include on-premises Exchange Server CAL rights. You will need to purchase Exchange CALs separately for your users.

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