Proficient Solutions to Merge Two Office 365 Tenants

Users query:- Hey, I am currently investigating the process of merging two Office 365 tenants. Here is the scenario. There are two separate tenants, each with its own billing, users, and OneDrive for Business data pools. Each tenant has its own domain.”

In this article, we discuss the need to transfer mailboxes and service settings from one Office 365 to another Office 365, it is advisable to collaborate with the SysInfo Office 365 Backup Tool, if you have a substantial number of users exceeding or a significant volume of data to migrate. This ensures a smooth and efficient migration process for your organization.

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Need to Merge Two Office 365 Tenants

To perform a tenant-to-tenant migration, the following common scenarios are as follow:
Mergers, Acquisitions, Moving tenants into parent Office 365 tenants.

  • In one place, Administrator can manage the whole organization.
  • The IT processes, such as user and permission management, security measures, monitoring systems, billing procedures, and more, have been optimized for simplicity, reducing the time required for implementation and management.
  • The security enhances after the merging of two Office 365.
  • Centralizing data and enhancing its management can help organizations in achieving improved compliance with industry regulations and standards.
  • It is beneficial for better visibility into the usage and the activity of Office 365 over different divisions or supplemental.

2 Approaches for Merging Two Office 365 Tenants

You can merge two Office 365 tenants by utilizing the provided approach, which involves combining a manual process and a professionally available solution. Let’s get started with the manual approach to merge two Office 365 tenants.

Method 1. Manually Merging Two Office 365 Tenants:

Merging Office 365 tenants of two accounts is a two-stage process,

Stage 1:- Export Items Like Emails, Contacts, and Calendars to a .pst File

  • Go to the Outlook application and sign in to the account which you want to merge.
  • Select the File option on the top of the outlook.
  • Open import/export and click on the Open/export feature.
  • And Select the Export to a file option.
  • Then choose the Outlook Data file(.pst) >>next.
  • Here you can add an email account that you want to migrate to another account and check the Include subfolders before clicking Next.
  • You can browse the destination path, and click on the finish button.

Stage 2:- Import Emails, Contacts, and Calendars to Outlook

  • Launch your Outlook application and click on the file.
  • Open import/export and click on the Open/export feature.
  • And here select the Import from another program or file option.
  • Then choose the Outlook Data file(.pst)>>next.
  • Navigate to the downloaded pst file, and click on the next button.
  • In the pop-up box, Select the desired Outlook account.
  • Finally, click on the Finish.

Now, we will give you a brief explanation of Why we should not opt manual approach.

Limitations of the Manual Approach

There are many faults in the manual approach. Some of them are mentioned below:

  • Users must carefully observe each command provided. The potential consequences of incorrect action could result in the loss of important information.
  • This approach is very lengthy and complex.
  • In this, users must have technical knowledge and also devote as much time to task completion.

The manual method requires a lot of technical expertise. An average user might find it frustrating and time taking, so we suggest a method recommended by IT experts i.e.SysInfo Office 365 Backup Tool.

Method 2. Use of Professional Tool to Merge Two Office 365 Tenants:

This application is among the best option to merge two Office 365 without any difficulty. With the help of this tool, users can merge Office 365 tenants.

Steps to Migrate Office 365 to Another Office 365:

  • Run the Office 365 Backup Tool and select Office 365 option.
  • Authenticate the Login by providing your Office 365 email address and password.
  • Then select Office 365 tenant account that you want to merge.
  • Use the import CSV option so that you can merge multiple Office 365 tenants at once.
  • Choose the emails that you want to merge with another tenant.
  • In the Save As option, select Office 365 Tenant and enter the Email ID to which you want to merge all the tenants.
  • Authenticate the Login and select the Mailbox user ID to which you are migrating your emails.
  • At last, Click on the convert button and all your emails will get merged from different Office 365 tenants.

Advantages of SysInfo Office 365 Backup Tool:

  • You have the option to Remove duplicate emails.
  • An exclusive feature is available like the Date range filter.
  • You can export Office 365 to other 15+ email clients.
  • A preview option is available which gives the user easy access to view the selected files.
  • Save your files into different file formats for example PST, EML, MBOX, MSG, CSV, HTML, and PDF.


We have discussed two methods in detail. Both methods have their advantages and disadvantages. The manual method can be lengthy and time taking, It requires sound technical knowledge to execute these steps with perfection. On the other hand, SysInfo Office 365 backup tool has an easy GUI. It maintains data integrity while merging two Office 365 tenants. Apart from these, you can go through the blog if you are looking for a straightforward solution to merge multiple PST files into one.

About The Author:

As a content writer, I specialize in Email Migration, Data Recovery, Email Backup, and File Management. I have been writing professionally for two years now. There is so much information available in this field that I am intrigued by the newer technologies and techniques.

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