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How to Assign Licenses for Microsoft 365 Developer Tenant Mailboxes
Question details
Users need to know how to properly provision Exchange Online mailboxes for test users within a Microsoft 365 Developer Tenant.
- Product
- Microsoft 365
- Device & OS
- not provided
- Scenario
- Creating test users and setting up mailbox profiles in a Microsoft 365 Developer tenant environment.
- Observed behavior
- Creating users in Microsoft Entra ID alone does not automatically create valid Exchange Online mailboxes or mailbox-based profile data without proper licensing.
Ensure you have global administrator or billing administrator privileges in your Microsoft 365 Developer tenant before attempting to assign licenses to your test users.
Assign Exchange Online Licenses to Test Users
Manually assign the required Exchange Online or Microsoft 365 licenses to your Entra ID users so the system can successfully provision their mailboxes.
In Microsoft 365, user identities and mailboxes are handled separately. Creating a user identity in Microsoft Entra ID (formerly Azure AD) simply establishes their account credentials. To generate mailbox-based profile data, an active license must be linked to that identity.
Navigate to the Microsoft 365 admin center and log in using your developer tenant administrator credentials.
On the left-hand navigation menu, click on 'Users', and then select 'Active users'.
Find and check the boxes next to the names of the test users who need an Exchange Online mailbox.
Click on 'Licenses and apps' in the top menu or side panel. Check the box for your available Microsoft 365 or Exchange Online license, and click 'Save changes'.
Activate a Temporary Microsoft 365 E5 Developer Trial
If you do not have sufficient licenses for testing, you can use the Microsoft 365 E5 developer trial to acquire temporary licenses.
Looking for a Free, Lightweight Office Suite for Your Workstation?
While you manage your Microsoft 365 developer tenant configurations in the cloud, you can use WPS Office as a free, powerful alternative for managing your local documents, spreadsheets, and presentations. It offers a familiar interface and avoids complex licensing hurdles for basic productivity tasks.
- 1. Download the Installer: Visit the official WPS Office website and click the free download button for your operating system.
- 2. Install WPS Office: Run the downloaded installer and follow the quick on-screen instructions to set up the software.
- 3. Start Creating: Open WPS Office and immediately start editing Word, Excel, or PowerPoint files without requiring a complex subscription.
Frequently Asked Questions
Why aren't mailboxes created automatically for my Entra ID test users?
Creating a user in Microsoft Entra ID only provisions the identity and login credentials. An Exchange Online mailbox requires a valid, assigned license (like Exchange Online Plan 1/2 or a Microsoft 365 E-suite license) to generate the actual mailbox-based profile data.
Can I create hundreds of Exchange mailboxes without buying licenses?
No. Microsoft explicitly requires a license for each mailbox. There is no supported way to create individual Exchange Online mailboxes in bulk without having the necessary licenses available in your tenant.
How long does it take for a mailbox to appear after assigning a license?
Typically, mailbox provisioning begins immediately after license assignment and completes within 5 to 15 minutes. In some rare cases, depending on server load, it can take up to 24 hours for the mailbox to become fully functional.
What happens to the mailboxes when the developer trial expires?
When a Microsoft 365 E5 Developer trial expires, the licenses become invalid. Test users will lose access to their mailboxes, and the mailbox data will be held for a grace period before being permanently deleted, unless the subscription is renewed.
