Introduction

When a business separates into two independent organizations, one of the biggest IT challenges is moving Microsoft 365 data from the existing tenant to a new one. Administrators must migrate user mailboxes, OneDrive accounts, SharePoint sites, Microsoft Teams, permissions, and domains while minimizing downtime and maintaining business continuity.

Although Microsoft provides native migration capabilities, they often require multiple configuration steps, PowerShell commands, migration licenses, and separate methods for different workloads. For small and medium-sized organizations, this can significantly increase migration time and administrative effort.

This guide explains how to perform a Microsoft 365 tenant-to-tenant migration during a company split using the Aryson Tenant to Tenant Migration Tool.

Challenges of Native Migration During a Company Split

Administrators commonly face several issues when relying solely on Microsoft’s native tools:

• Multiple migration methods for different workloads
• Additional Cross-Tenant User Data Migration licensing
• Complex PowerShell configuration
• Limited SharePoint tenant-to-tenant migration support for Business tenants
• Teams channel conversations are not migrated
• Manual recreation of permissions and settings
• Increased risk of downtime during cutover
• Time-consuming migration planning and execution

Why Choose Aryson Tenant to Tenant Migration?

Aryson provides a centralized solution for migrating Microsoft 365 tenants without managing separate native migration processes.

Key capabilities include:

• Mailbox migration
• Shared mailbox migration
• Archive mailbox migration
• OneDrive migration
• SharePoint Online migration
• Microsoft Teams migration
• Public Folder migration
• Permission migration
• Folder hierarchy preservation
• Metadata preservation
• Incremental migration
• Modern Microsoft authentication
• Migration reports
• Batch user migration
• Automatic mailbox mapping
• Selective data migration
• No PowerShell scripting required

Steps to Perform Microsoft 365 Tenant-to-Tenant Migration

Step 1

Download and install the Aryson Tenant to Tenant Migration Tool.

Step 2

Choose Microsoft 365 Tenant Migration.

Step 3

Authenticate the source Microsoft 365 tenant using Global Administrator credentials.

Step 4

Authenticate the destination tenant.

Step 5

Map users automatically or import a CSV file.

Step 6

Select the workloads to migrate:

• Exchange Online
• OneDrive
• SharePoint Online
• Microsoft Teams
• Public Folders

Step 7

Configure migration options such as:

• Date filter
• Skip existing items
• Incremental migration
• Preserve permissions
• Maintain folder hierarchy

Step 8

Validate the mapping.

Step 9

Start the migration.

Step 10

Review the migration report after completion.

Also Read: Microsoft 365 Tenant Merger and Acquisition

Why Aryson Is a Better Choice Than Native Migration

Best Practices Before Migration

• Verify source and destination tenant health.
• Back up Microsoft 365 data before starting.
• Prepare user mapping in advance.
• Notify users about the migration schedule.
• Test with a small group of users before the full migration.
• Verify mail flow after migration.
• Validate permissions and shared resources.

Conclusion

Migrating Microsoft 365 during a company split involves much more than moving email. Organizations must transfer mailboxes, OneDrive accounts, SharePoint sites, Teams data, permissions, and user settings while minimizing disruption. Although Microsoft offers native migration options, they often require multiple tools, PowerShell configuration, and workload-specific processes.

Aryson Tenant to Tenant Migration Tool simplifies the entire migration by providing a centralized solution for transferring Microsoft 365 data between tenants while preserving mailbox content, SharePoint documents, OneDrive files, permissions, and folder structure. It reduces administrative complexity, shortens migration time, and helps organizations complete tenant migrations with minimal business interruption.

This approach directly addresses the pain points in the scenario you shared—company divestiture, Business Premium licensing, limited migration window, and the desire to avoid a lengthy, manual native migration process—making it highly relevant for IT administrators searching for practical alternatives.

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