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Do Shared Mailboxes Require a Microsoft 365 License? Guide
Question details
The user needs to understand whether shared mailboxes in Microsoft 365 require a paid license and what specific features or storage scenarios trigger additional licensing requirements.
- Product
- Microsoft 365
- Device & OS
- not provided
- Scenario
- Managing shared mailboxes, ensuring compliance, and handling increased storage limits within a Microsoft 365 environment.
- Observed behavior
- Shared mailboxes are generally free, but specific advanced features (like litigation hold) or increased storage limits above 50 GB require appropriate paid licenses.
Before making changes, log into your Microsoft 365 admin center to verify your current subscription tier and check the existing storage usage of your shared mailboxes.
Understand Basic Licensing and Storage Limits for Shared Mailboxes
Shared mailboxes are free by default up to 50 GB, but require a specific license to expand storage capacity.
In most basic scenarios, Microsoft 365 allows you to create shared mailboxes without consuming a user license. This is ideal for generic addresses like 'info@' or 'support@'.
Navigate to the Microsoft 365 admin center, go to 'Teams & groups', and select 'Shared mailboxes'. Any mailbox you create here will automatically be granted 50 GB of storage without requiring a dedicated license.
If a shared mailbox approaches the 50 GB limit, you must go to the 'Billing' > 'Licenses' section and assign an Exchange Online Plan 2 license to that specific shared mailbox. This action automatically expands its storage capacity to 100 GB.
Apply Licenses for Advanced Compliance Features
Features such as litigation hold, in-place archiving, and data loss prevention mandate appropriate Microsoft 365 licensing.
Verify Access Rules for Microsoft 365 F1 and F3 Users
Frontline worker licenses (F1 and F3) carry specific restrictions regarding who can access Exchange features and shared mailboxes.
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Frequently Asked Questions
Can a shared mailbox be used without assigning it a password?
Yes, shared mailboxes do not have their own password by default. Licensed users access them by logging into their own personal Microsoft 365 account and using the 'Open another mailbox' feature in Outlook on the web, or by adding it to their Outlook desktop client.
What happens if a shared mailbox exceeds 50 GB without a license?
If a shared mailbox exceeds the 50 GB limit without being assigned an Exchange Online Plan 2 license, it will stop receiving and sending new emails until storage is cleared or the proper license is applied.
Can I assign an Exchange Online Plan 1 license to a shared mailbox to increase its size?
No. Assigning an Exchange Online Plan 1 license does not increase the shared mailbox size beyond the default 50 GB. To increase the capacity to 100 GB, you must assign an Exchange Online Plan 2 license.
Does every user accessing the shared mailbox need their own license?
Yes, any user who needs to access, read, or send emails from a shared mailbox must have their own valid Microsoft 365 or Exchange Online license assigned to their individual account.
