CSV Mapping Tips for M365 Tenant to Tenant Migration

Microsoft 365 tenant-to-tenant migration is all about accurate user and data mapping. CSV mapping ensures users, OneDrive content, SharePoint libraries and even permissions are migrated correctly between tenants.

We have listed the tips below on how to create and test CSV mappings to make your migration smooth. We also covered why CSV mapping is the preferred method for IT teams for M365 Tenant to Tenant Migration.

Why CSV Mapping is the Preferred Approach for M365 Tenant to Tenant Migration

CSV mapping is the Microsoft 365 migration industry standard. It allows IT admins to specify and manage how source tenant users, OneDrive accounts and SharePoint sites are mapped to their respective destinations in the target tenant.

Through CSV mapping:

  • You can assign users to correct accounts.
  • Identify SharePoint document libraries and OneDrive paths exactly.
  • Preserve folder structures and prevent conflicts.
  • Minimize manual intervention and migration errors.

Our Microsoft 365 to Microsoft 365 migration tool, CloudFuze Migrate reads mapping data directly from CSV files for a structured file, folder, permissions and metadata migration between tenants.

Tips to Get Your CSV Mapping Right for M365 Tenant to Tenant Migration

1. Use the Right Mapping Syntax

Syntax is key. For example, when defining OneDrive root folder paths, use slashes (/) and full URLs. SharePoint mappings must have full site collection and document library paths. A small syntax error will result in mismatches or failed migration.

Use the Right Mapping Syntax for CSV mapping

2. Add User and Folder Paths Correctly

When mapping users across tenants, always use their full UPN (User Principal Name) information. For OneDrive and SharePoint, specify the root folder and subfolder paths as they appear in the target tenant.

Example:

For SharePoint libraries, prepare the target sites and libraries first, then copy and paste the exact paths into the CSV file to avoid errors.

3. Validate the CSV Mapping Using Our Migration Tool

Before you start the migration, import the CSV file into the Microsoft 365 tenant migration tool. At CloudFuze, our platform will validate your CSV mappings.

Click on the CSV button, as shown in the screenshot below.

Validate the CSV Mapping Using Our Migration Tool

Then download the CSV file by clicking on the download CSV button.

Validate the CSV Mapping Using Our Migration Tool

The system will show you any invalid or missing paths so your IT staff can fix them before you start the migration.

A “PASS” in both “Source Path Review” and “Destination Path Review” columns means your CSV mapping is ready to go.

Validate the CSV Mapping Using Our Migration Tool

4. Finalize the Mapping Paths and Get Your Team Involved

Once validated, have a final CSV mapping review with all stakeholders. Verify users, libraries and permissions match the migration scope. Once approved, our M365 tenant to tenant migration tool will use the mapping file to perform the migration without the need to re-upload.

Finalize the Mapping Paths and Get Your Team Involved

Migrate Microsoft 365 Tenants with CloudFuze

We at CloudFuze make complex Microsoft 365 tenant-to-tenant migrations easy with powerful CSV mapping.

With 12+ years of experience with OneDrive, SharePoint, Outlook and Teams data migration for enterprises, we perform your M365 tenants to tenant migration with security, precision and zero data loss. Whether it’s a large-scale M&A migration or a simple tenant rebranding, we ensure your project is executed smoothly.

You can also explore our in-depth case studies, which shows successful collaborations with leading global enterprises.

Share your requirements for a free consultation and get started today with our proven enterprise migration platform.

Frequently Asked Questions

1. Do I always need CSV mapping for M365 tenant-to-tenant migration?

Not always. For small migrations with a few users, auto-mapping may be sufficient. But for large-scale enterprise migrations (hundreds or thousands of users), CSV mapping is strongly recommended to ensure accuracy and control.

2. What happens if there are errors in my CSV mapping file?

Errors in syntax, user UPNs, or SharePoint paths can cause the migration job to fail. That’s why it’s important to validate the CSV mapping.

3. How do I verify my CSV mapping before migration?

Upload the CSV file to your migration tool. With CloudFuze, the system automatically checks source and destination paths and marks them as PASS or flags issues that need correction.

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