How to Manage Multiple Office 365 Tenants? Effective Solution for Business Organization

Written By Mohit Jha
Anuraag Singh
Approved By Anuraag Singh
Published On January 28th, 2023
Reading Time 6 Minutes Reading

In this article, we will explore the challenges of managing multiple Office 365 tenants, including how to keep data and user information secure, how to streamline administration and reporting, and how to ensure compliance with industry regulations and standards. Whether you’re new to managing multiple tenants or are looking to improve your current setup, this article will provide you with the information you need to effectively manage your Office 365 tenants.

Microsoft Office 365 has accomplished great success in the market after its launch. It provides hybrid connectivity for easy migration and continuously delivers new functionalities at an impressive rate. It’s all amazing. Despite the fact that Microsoft’s FastTrack program is accessible to enable organizations to move to Office 365, sadly no tool is available to merge Office 365 tenants.

Well, this is surprising because according to a recent survey, it takes at least 13 hours/ month to manage an O365 tenant that includes 1 to 50 accounts. Hence, managing more than one Office 365 tenant can be problematic and a waste of our precious time. In this technical guide, we’ve gathered some common difficulties with multiple Office 365 tenants and an incredible technique to manage multiple tenants in Office 365.

The Best Way to Manage Multiple Office 365 Tenants is to Migrate Them into One

  • Step 1. Download the Tool & run it on your PC.
  • Step 2. Select Office 365 as Source, & Destination.
  • Step 3. Login using Office 365 Admin credentials.
  • Step 4. Create mapping for Bulk user migration.
  • Step 5. Validate Permission & Click on Start button.

5 Most Common Problems With Managing Multiple Office 365 Tenants

Below are some of the common problems users encounter while using multiple tenants.

  • Mailbox Reassign: Microsoft does not allow users to configure a tenant-to-tenant migration in a direct manner. Also, users can not ask Microsoft to reassign the mailboxes to any other O365 tenant even in the same location. In case, the mailboxes are in two different tenants and can be in a single O365 mailbox database in the service yet, one cannot get reassigned them. One needs anything in-between.
  • Password Migration: Users can not move passwords from one Office 365 to another for the end-users. For all the users who are utilizing DirSync and local AD accounts, the answer comprises their Active Directory migration. Make sure that the cloud-only end-users need to set a password. If users are required to change their email addresses and Online service IDs while switching then, they need to update the credentials on their devices.
  • Custom Domain: A custom domain cannot be available to two different Office 365 tenants at once. One needs to remove a domain from the first tenant prior to adding it to the second one. If the email flow breaking is not allowed for a particular time period, this can be an issue. In most cases, it might take a few minutes to remove the domain from an Office 365 tenant and add it to another tenant, however, sometimes it may also take a long time. Only in some exceptional cases, it can require raising a service request to Microsoft for a complete addition or removal.
  • Username Changes: While performing potential temporary or permanent username changes, MS Outlook, and other clients can fear changing their mailbox identities. This can be potentially alleviated by executing a slow migration among tenants yet, Outlook needs to be reconfigured in most cases.
  • Transfer of other Services: While using multiple Office 365 tenants, one also needs tools to transfer other services. Users may need to migrate SharePoint sites, Lync Online Contacts, Yammer Contacts, and OneDrive for Business as well as merge them all together. Users may require professional software to perform the task.

What are the Benefits of Having Single Tenants in Office 365? 

Single tenants in Office 365 provide a number of benefits, including:

  • Enhanced Security: With a single tenant, all data and user information is kept separate from other organizations, providing an added layer of security.
  • Customizable Features: IT administrators have more control over the configuration of Office 365 features, which allows them to tailor the service to the specific needs of the organization.
  • Compliance: A single tenant allows organizations to more easily comply with industry regulations and standards, such as HIPAA and GDPR.
  • Better Reporting: With a single tenant, IT administrators have access to more detailed usage and activity reports, which can be used to optimize the use of Office 365 within the organization.
  • Better Integration: Single tenants can more easily integrate with on-premises systems and other third-party services, providing a more seamless user experience.

Manage Multiple Microsoft Office 365 Tenants with Ease

All the organizations going through acquisitions can consolidate multiple Office 365 tenants as it is the safest and most convenient way to manage multiple Office 365 tenants. They can execute it manually but, there is a high chance, that the mailboxes, accounts, directories, or email messages could be lost, deleted, or left behind. Also, there are possible chances that some of the objects might duplicate themselves, as it may cause unnecessary management complexities, expenditure, and downtime.

Therefore, we recommend using Office 365 Mailbox Migration Tool to migrate mailboxes from one account to another in Office 365. The tool is completely secure and allows users to export mailboxes and shared mailboxes. It has the ability to migrate entire data among multiple tenants. Follow the steps below to move data from one Office 365 tenant to another:

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Manage Multiple Office 365 Tenants Using Software Solution

Step 1. Start the software then select Office 365 as a source & as a destination from the initial screen.

Step 2. Select the item which you want to migrate from the Workload selection, tool also provides Migrate document permissions, Use group Mapping options, and a Date-based filter. Apply options according to requirement then click on Next.

Step 3. Now, enter Office 365 source tenant admin ID and Application ID, then click on the Validate button to validate permissions.

Step 4. Now, that permissions validation is successful, click on Next.

Step 5. Enter Office 365 destination Admin ID & Application ID, then click on Validate.

Step 6. After validating permissions click on Next.

Step 7. Now, we have to create a mapping between Office 365 source & destination users. In order to create a mapping, the tool provides 3 options – Fetch users, Import users, and Download templates. Choose any one option and click on Next to manage multiple Office 365 tenants.

Step 8. Now, you can see mapping is created between source & destination users. Click on the Validate button to validate permission.

Step 9. Now, click start to migrate.


Organizations often face various problems while handling more than one Office 365 tenant. Therefore, in this article, we have disclosed all the possible and most common issues that users face while using multiple Office 365 tenants. In addition to it, we have also provided professional software that can easily mitigate the issue of having multiple tenants.