When an organization moves its users to a different Microsoft 365 tenant, OneDrive data should be included in the migration plan from the beginning. User accounts can contain years of documents, project folders, spreadsheets, presentations, and other business information. If the migration is not properly organized, administrators may find it difficult to track users, data volumes, and destination accounts.

Microsoft provides a native approach for supported OneDrive cross-tenant scenarios. Administrators first prepare the source and destination tenants, verify licenses and permissions, establish the required migration relationship, and then map source users with their corresponding destination accounts. Once the configuration is complete, the eligible OneDrive content can be moved to the new environment.

For a large organization, I think migrating OneDrive from one tenant to another project should be divided into manageable groups. Administrators can start with a pilot batch containing users from different departments and different OneDrive sizes. This makes it possible to identify authentication, mapping, or data-related issues before the remaining accounts are processed.

Another useful step is reviewing the source data before migration. Some users may have thousands of files, while others may have only a few folders. Identifying large accounts in advance can help IT teams schedule their migration more effectively. It can also be useful to determine whether all files need to be moved or whether specific folders or file types are more important.

During my research, I found the DRS Softech Office 365 Tenant to Tenant Migration Tool, which supports bulk OneDrive migration between Microsoft 365 tenants. It provides source and destination authentication, user mapping, migration monitoring, and preservation of the original file and folder hierarchy. It also supports migration of the latest versions of updated files.

For organizations handling repeated migration sessions, the Skip Previously Migrated Data option can be useful. Administrators can also apply Date Filter, File Extension Filter, File Size Filter, and Custom Folder options when they need more control over the content being transferred.

I would also recommend keeping a migration tracker throughout the project. It can include source account, destination account, migration date, batch number, status, and verification results. This becomes particularly helpful when hundreds of OneDrive accounts are involved.

After each batch, administrators should verify selected destination accounts. Checking important folders, recent documents, file versions, and migration reports can help confirm that the transferred content is available as expected.

Overall, cross tenant OneDrive migration  requires proper coordination between tenant preparation, user mapping, data selection, migration scheduling, and verification. Treating it as a structured project rather than a simple file transfer can make the process easier to monitor and manage.