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Unexpected Microsoft Defender for Office 365 License Requirement for Shared Mailboxes

Unexpected Microsoft Defender for Office 365 License Requirement for Shared Mailboxes
A question about shared mailboxes brought up the topic of licensing requirements when a tenant has Microsoft Defender for Office 365 (MDO). The news is not good. Once MDO is active, every shared mailbox needs an MDO license, and every user mailbox must also be licensed for MDO (those with E5 licenses are covered). At $5 per month, those MDO licenses can ramp up to a considerable cost. Ouch!

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Office 365 for IT Pros

Office 365 for IT Pros is the world's best book about Office 365 architecture, management, and deployment. Written by a team of highly experienced Microsoft MVPs, Office 365 for IT Pros is refreshed monthly.

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