how many exchange licenses required across 3 servers that will be part of a DAG

Hi

You need a license for each Exchange Server instance that you install, and also a CAL for each user that will access the Server. The link here gives details:

https://www.microsoft.com/en-us/microsoft-365/exchange/microsoft-exchange-server-licensing-licensing-overview.

The alternative would be to migrate to Microsoft 365, however I assume that there may be a regulatory requirement in your organisation if you are considering Exchange. You can find Microsoft 365 licensing details here, which may be more cost effective than running local Exchange Servers:

https://www.microsoft.com/en-ie/microsoft-365/business/compare-all-microsoft-365-business-products

Hope this helps,

Thanks

Michael Durkan

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