Microsoft Issues Updated Guidance for Defender for Office 365 Licensing

Some inconsistencies in the MDO P2 service description and licensing terms exposed a need for tenants to license every user and shared mailboxes. Microsoft has changed the service description and licensing terms to make them simpler. Mailboxes still need MDO licenses, but only if they benefit from MDO protection, including MDO P2 if that’s what they use. Tenant admins have some extra work to do to deploy policies. All explained here.

https://office365itpros.com/2025/10/31/mdo-p2-licensing/