Defender Licensing shared mailboxes

New Contributor


to add Defender to a shared mailbox it is required the Defender license only, or the Defender + an exchange P1 license?

In the past I'm quite sure the P1 was required, today seems not, but I cannot find explicit doc.




2 Replies
Exchange license is only needed if the shared mailbox is above 50GB or has archive/hold enabled. But it goes without saying that no one here is authorized to quote licensing terms on behalf of Microsoft, so best check with your local MS reps.
best response confirmed by topogigio (New Contributor)
Hi there! - you may find the following useful:

If you're not using the shared mailbox in any way which requires an Exchange Online Plan 1 license, but it is benefitting from MDO protection, you only need the MDO license.