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Zohaib_Yousuf's avatar
Nov 22, 2025
Solved

Could any one explain Exchange Server SE Licensing Model?

I have the following M365 licenses in my education tenant:

  • Microsoft 365 A5 without Audio Conferencing (Student Use Benefit)

As per my understanding, each user requires an A3/A5 license to access their mailbox on an Exchange Server (Exchange SE). Since A3/A5 licenses already include Exchange Online, do we still need to assign these licenses to each on-premises user, or is this only for compliance purposes?

For example, if we have 100 on-premises users, must all 100 users be assigned A3/A5 licenses in Microsoft 365?

Reference articles are below.

Microsoft Product Terms

Please correct me if I am wrong.

 

 

  • Assigning the M365 A3/A5 license is mandatory for compliance, even if the mailbox is fully on-premises.

    There is no separate “Exchange SE User CAL”, your cloud suite license is the entitlement. The license simply grants the user rights to use Exchange Server SE. 

2 Replies

  • Assigning the M365 A3/A5 license is mandatory for compliance, even if the mailbox is fully on-premises.

    There is no separate “Exchange SE User CAL”, your cloud suite license is the entitlement. The license simply grants the user rights to use Exchange Server SE. 

    • Scott_Schnoll's avatar
      Scott_Schnoll
      Copper Contributor

      See also, https://www.microsoft.com/licensing/terms/product/CALandMLEquivalencyLicenses/all. Note, there is no assignment of these licenses to on-prem users. You simply need to ensure that you have purchased enough licenses to cover on-prem mailboxes.

      The EUR that come with MA3 and MA5 provide the server licenses, as well. But if you go that route, only users with MA3/MA5 licenses can access the server (although external users can send email through it).

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