Mailbox migration from Office 365 to Office happens due to mergers, acquisitions, rebranding, or reorganization. To meet the demand of different cloud migrations, we have manual and automated solutions. As we know Office 365 to Office 365 migration is not as straightforward as it seems. It requires planning, expertise, and the right tools to ensure zero data loss, minimal downtime, and smooth migration. ![Office 365 to Office 365 Migration Service.png](https://cdn.steemitimages.com/DQmdFQjsy1N8dpiosENouKmV1tzs843MMaKsu9H3xZFGi1w/Office%20365%20to%20Office%20365%20Migration%20Service.png) In this article, we will explore both manual and professional methods to perform tenant-to-tenant Office 365 mailbox migration. If you are not a techie, MailsDaddy Office 365 migration tool and MailsDaddy cloud migration services are the best choice for you. ## Why is Office 365 to Office 365 Migration Needed? Organizations may need to migrate mailboxes between Office 365 tenants in scenarios like:

Company mergers or acquisitions
Organizational rebranding
Domain name changes
Compliance or restructuring
Switching to a new region or Office 365 data center

In any case, migrating mailbox data (emails, contacts, calendars, tasks, etc.) from one Office 365 tenant to another without data loss is crucial. ## Automated Migration with MailsDaddy Office 365 to Office 365 Migration Tool MailsDaddy Cloud Migration Service and Office 365 Migration Tool are the first choices of many professionals as it is based only on selection, folder include/exclude, mapping, etc. Also, it helps in migrating Office 365 resources like OneDrive, SharePoint, and Teams. This tool simplifies the entire process and ensures 100% accurate and secure mailbox migration between tenants. ### Key Features of MailsDaddy Tenant to Tenant Migration Tool Try free demo: Office 365 Migration Tool

Easy Setup and Migration for Office 365
Migrate Mailboxes, Archive Mailboxes, and Shared Mailboxes.
Incremental Migration - Avoid duplicate items in re-runs.
Selective Migration - Migrate specific folders, date ranges, or categories.
Auto Map Mailboxes - Easily map source to destination users.
Multiple Login Options - Support for Basic and Modern Authentication.
No Size Limitation - Migrate unlimited mailbox data.
Real-Time Progress Reports and detailed logs.

### Key Features of MailsDaddy Cloud Migration Services Book Free Demo: Cross Tenant Migration Service

Direct Tenant to Tenant Migration - No need to export/import PST files.
Allow migrating Office 365 Resources: OneDrive, SharePoint, and Teams
Migrate Mailboxes and Archive Mailboxes
Incremental Migration – Avoid duplicate items in re-runs.
Auto Map Mailboxes – Easily map source to destination users.
Multiple Login Options – Support for Basic and Modern Authentication.
No Size Limitation – Migrate unlimited mailbox data.
Real-Time Progress Reports and detailed logs.

### Steps to Use MailsDaddy Office 365 Migration Tool

Download & Launch the Tool:
Install the software and run it on your system.
Login to Source Tenant:
Use Admin credentials with proper permissions to connect to the source Office 365.
Login to Target Tenant:
Similarly, connect to the target Office 365 tenant.
Fetch & Map Mailboxes:
The tool will automatically list source mailboxes. Use auto or manual mapping to match destination mailboxes.
Apply Filters (Optional):
Set date ranges, folder filters, etc., as per your migration needs.
Start Migration:
Click the “Start” button to begin mailbox transfer.
Check Reports:
After migration, review the report and verify mailbox content in the new tenant.

### Why Choose MailsDaddy?

No PowerShell Required – Fully GUI-based interface.
Quick Setup and Fast Migration
Dedicated Support Team – Assistance throughout the process.
Free Demo Available.

### Manual Method to Migrate Office 365 Mailboxes Microsoft does not provide any direct migration feature for tenant-to-tenant migration in the Office 365 admin center. However, the manual method involves several steps using PowerShell. Also, we suggest saving a backup of Office 365 mailbox to PST and then following the steps below. If you don't have PowerShell skills, consider choosing MailsDaddy cloud services. ### Watch Manual Step: https://www.youtube.com/watch?v=BjMrYwTgjp0 ### Manual Steps:

Prepare Source and Target Tenants
Create Mail-Enabled Users in Source Tenant.
Save the Tenant ID of both the source and target
Create a Migration app and Secret value in the target
Manage Endpoint and Organization Relationship in Target
Configure Organization Relationship in Source
Create a Mail user in Target
Find and Add ExchangeGuid and ExchangeLegacyDN of the source into the target
Test Migration Server
Assign License to Mail user in target
Create Migration batch in Target
Monitor Migration. That’s it!

Pros of the Manual Method

Free
Allows for complete control over each step.

Cons of the Manual Method

Time-consuming and complex, especially for non-technical users.
Requires multiple permissions and PowerShell knowledge.
High chances of making a mistake or skipping a step.

### Conclusion Migrating mailboxes from one Office 365 tenant to another is often necessary but not always easy. The manual process is long, requires expertise, and is prone to errors. To avoid hassle and risk, using a professional solution like the MailsDaddy Tenant to Tenant Migration Tool or Cloud Service is highly recommended. It ensures a seamless migration experience with minimal effort and maximum data integrity. Whether you’re a small business or an enterprise, MailsDaddy helps you perform Office 365 to Office 365 migration with confidence and speed. Also Read: Google Workspace to Office 365 Migration