In the year 2026, Office 365 Tenant-to-Tenant Migration requires careful planning to ensure that business communication and data remain protected. Whether the migration is driven by mergers, acquisitions, or organisational changes. The main concern is to move data between tenants securely and maintain integrity. Therefore, a secure migration process is used to prevent emails, maintain folder structures, and prevent data loss. Moreover, by following the right approach and using proven methods, organisations can safely transfer Office 365 data from one tenant to another. Also, make sure compliance and user accessibility are maintained at every stage of the process.
What is Office 365 Tenant-to-Tenant
Migration?
To begin with, Office 365 tenant-to-tenant
migration involves transferring data from one Office 365 tenant to another.
Follow to know more reasons for Microsoft Tenant-to-Tenant Migration Services:
·
It
includes mailboxes, emails, attachments, and contacts.
·
The
primary goal is to transfer data from the source to the target tenant.
·
Most
importantly, to maintain data integrity and company continuity.
·
It is
required during the company domain change and rebranding.
Why is Office 365 Tenant-to-Tenant
Migration challenging?
This process is complex due to Microsoft
cross-tenant limitations. Each tenant operates independently, which makes
migration difficult. See common challenges arise below:
·
The main
problem is the risk of data loss, permission conflicts, and large mailbox
sizes.
·
Microsoft
does not move data directly to another tenant.
·
Improper
planning may interrupt the business email workflow.
· The process requires technical-level skills for data migration.
Now, we will discuss the methods to perform
migration for an Office 365 tenant to another tenant.
Method to perform Office 365
Tenant-to-Tenant Migration
There are mainly two methods for O365
tenant-to-tenant migration. We will discuss both methods step-by-step for
smoother conversion. Choose any of the methods to migrate Office 365 from
tenant to tenant.
Method
01: Microsoft 365 Tenant to Tenant Migration Manually
Now, see the steps below for Microsoft 365 (Office 365) tenant-to-tenant migration. Moreover, this method is suitable for small organisations and uses PST export/import. Follow the procedure below to perform migration:
Step 01: Prepare the Source and
Destination Tenants
1.
To
initiate the process, make sure both tenants have Global Admin access.
2.
Then,
verify the destination tenant is active.
3. Also, assign the Microsoft 365 licenses to users in the destination tenant.
Step 02: Create Users in the Destination
Tenant
1.
Further,
manually create user accounts matching the source tenant.
2.
Next,
assign temporary or final email addresses.
3. Along with that, apply licenses so that mailboxes are created.
Step 03: Enable Outlook Export
Permissions
1.
In the
source tenant, assign the Mailbox Import Export role to the admin.
2. Now, you have to export your mailbox data to PST.
Step 04: Export Mailboxes from Source
Tenant
You
can export your mailbox data using:
1.
First,
Microsoft Purview (eDiscovery).
2.
Second,
search user mailboxes.
3. And third, export results as PST files.
Step 05: Download Exported PST Files
1.
Besides
that, download your exported PST files to a local system.
2.
Besides
that, you can now download your exported PST file.
3. Furthermore, make sure you have sufficient disc space on your system.
Step 06: Add Domain to Final Tenant
Destination (Optional)
1.
After
that, you have to remove the domain from your source tenant.
2.
Then,
verify and add it to your final destination tenant.
3. Now, you have to update DNS records if required.
Step 07: Import your PST Files into the
Destination Tenant
You
can import your PST files using the following steps:
1.
To start
with, Microsoft 365 Import Service (Azure Storage + Mapping CSV).
2. And Outlook PST Import (for small mailboxes).
Step 08: Verify your Migrated Data
1.
Furthermore,
check your emails and attachments.
2.
Now, make
sure your mail flow works correctly.
3. After that, ask users to confirm their mailbox data accessibility.
Step 09: Reconfigure Outlook &
Devices
1.
Also,
recreate Outlook profiles.
2.
Now,
reconfigure your mobile devices and apps.
3. And then, apply mailbox permissions if required.
Step 10: Decommission the Source Tenant
1.
Now, take
a final backup of your mailbox files and remove the unused tenant licences.
2.
Lastly, it
safely disables or deletes the old tenant.
Limitations
of Manual Tenant-to-Tenant Migration
·
It is
time-consuming and contains complex steps.
·
Further,
for large mailboxes, it is a slow method.
·
There is a
high risk of errors and loss of data during the migration process.
·
Moreover,
for users who have data in bulk, this method is not useful.
·
Apart from
that, in this method, there is no automation or batch handling.
Method
02: Ultimate Solution to Office 365 Tenant-to-Tenant Migration
The Email Backup Wizard software
is the best solution for large organisations, as they widely use Office 365.
This tool is made with several embedded core features that help users to
migrate their mailboxes smoothly. Also, it secures data integrity during
migration and prevents data loss. Users can select the source from which they
want to migrate their data, like Primary
Mailbox, Public Folder, and Online Archive. To know
more about the additional features of this software, follow the mentioned
pointers:
·
It has a Date Filter option
that consists of a Start date and an End date.
·
Moreover,
it migrates emails without attachment files.
·
Additionally,
if you enable skip duplicate emails, it will skip previously migrated data.
·
Further, Incremental Backup saves
time and space by backing up only changed data.
Step-by-step
Process to Easily Migrate Data
1.
Firstly, begin downloading the Email
Backup Wizard Software on your system.
2.
Select Office 365 from the left panel
and enter your login credentials for Office 365.
3.
Next, select the folder from which you
want to migrate data, such as Primary Mailbox, Public Folder, or Online
Archive, and then click Next.
4.
Now, you can preview the fetched
mailbox data and proceed further by clicking Next.
5.
Click on Migrate in Email Client,
and from the drop-down menu, select Office 365.
6.
Enter the login credentials for Office
365.
7.
After that, apply the additional
features for selective data migration and click Next to continue.
8.
Further, click on the Download
button to start migration.
Benefits
of O365 Tenant-to-Tenant Migration
·
Additionally,
it ensures a smooth transition during mergers, acquisitions, or restructuring.
·
Brings
users and data under a single tenant for easier administration.
·
Thereafter,
it enables teams from different tenants to work together seamlessly.
·
Afterward,
it maintains data integrity while meeting organisational policies.
·
In fact,
scalability makes it easier to manage future growth and organisational changes.
·
Furthermore,
it eliminates the need for IT to manage multiple Office 365 tenants.
Conclusion
To wrap up, we have covered all the aspects
to understand the Office
365 tenant-to-tenant migration. Whatever you choose, a free manual method
or a professional tool, the aim is the same. The manual approach is suitable
for small-scale data migration. But for enterprise-level organisations that
handle data in bulk and want a faster migration, it is recommended to use a
professional tool.
Frequently Asked Questions
Q 1. What data can be migrated during
Microsoft 365 Tenant-to-Tenant Migration?
Ans. You can migrate emails, mailboxes, folders,
attachments, and email metadata securely. It preserves the original folder
structure during the migration process.
Q 2. How long does O365 Tenant-to-Tenant
Migration take?
Ans. The migration time depends on mailbox size,
number of users, and internet speed.
With the migration tool, migrations are faster than manual methods and can
range from minutes to hours.
Q 3. What are the prerequisites for
Microsoft Tenant-to-Tenant Migration Services?
Ans. You need valid admin credentials, active
Microsoft 365 accounts, and stable internet connectivity. The migration tool
does not require complex scripting or advanced technical setup.
Q 4. What are the common challenges in
Microsoft 365 Tenant-to-Tenant Migration?
Ans. Common challenges include data loss risk, user
mapping issues, and downtime when using manual methods. But the migration
tool minimises these issues by ensuring secure and structured migration.
Q 5. Do users need new licenses after
tenant migration?
Ans. Yes, users must have active licenses in the
destination tenant to access migrated data. The migration tool migrates
data but does not manage or assign Microsoft 365 licences.