How Many Microsoft 365 Licenses Are Needed for Separate Mailboxes?
Question details
The user wants to know if a single Microsoft 365 subscription can support multiple independent mailboxes across different domains, or if separate licenses are required.
- Product
- Microsoft 365
- Device & OS
- not provided
- Scenario
- Setting up email accounts for multiple domains or users within a single Microsoft 365 subscription environment.
- Observed behavior
- Unlicensed mailboxes cannot be successfully added to Outlook, and users cannot access independent Exchange mail services without an assigned license.
Log in to the Microsoft 365 Admin Center with an administrator account to verify your currently available licenses and determine if the additional mailboxes require separate sign-in credentials.
Assign Individual Licenses for Independent Mailboxes
If each mailbox requires its own unique sign-in credentials and independent access, you must assign a separate license (such as Exchange Online Plan 1 or Microsoft 365 Business Standard) to each user account.
Microsoft 365 assigns licenses on a per-user basis. Even if one user can install Office apps on multiple devices, creating a new user with a distinct sign-in and independent mailbox always requires consuming an additional license.
Sign in to the Microsoft 365 admin center and navigate to Users > Active users in the left-hand menu.
Click on the user account that requires an independent mailbox to open the properties panel.
Go to the 'Licenses and apps' tab, check the box for an appropriate license (e.g., Microsoft 365 Business Standard or Exchange Online Plan 1), and click 'Save changes'.
Use Shared Mailboxes as a Free Alternative
If you only need additional email addresses (e.g., info@domain.com) and do not need separate sign-in credentials for them, you can create Shared Mailboxes at no extra licensing cost.
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- 1. Download the Installer: Visit the official WPS Office website and download the free installation package for your operating system.
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Frequently Asked Questions
Can one Microsoft 365 Business Standard license cover multiple users?
No. A single Business Standard license is designed for one user. Although that user can install the Office applications on up to 5 PCs/Macs, 5 tablets, and 5 smartphones, you cannot share one license across multiple independent user accounts.
Do I need an extra license to add a new domain to Microsoft 365?
Adding a new custom domain to your Microsoft 365 tenant is free. However, if you want to create independent user accounts under that new domain, each new user account will require its own license.
Why can't I add an unlicensed mailbox to my Outlook desktop app?
Unlicensed mailboxes do not have the Exchange Online services enabled, which means they cannot function as independent email accounts. To add a mailbox directly to Outlook, the account must have an active license assigned.
How do I access a shared mailbox without paying for another license?
Once an admin creates a shared mailbox and grants your primary licensed account permission, the shared mailbox will automatically appear in your Outlook desktop app or Outlook on the web under your primary mailbox folders.
