We used CloudM to migrate Outlook & OneDrive between tenants, once it has started and in the later migrations you could just leave it, keeping an eye on the progress. The product can be used for multiple sources & destinations including Google & Microsoft Office.

CloudM simplifies the migration process with an intuitive interface and clear step-by-step guidance. Their support team is knowledgeable and responsive.

CloudM has been a game changer in simplifying our acquisitions of other companies. So far we have acquired 2 other companies, that were both running Google Workspace environments, and thanks to the simple and intuitive configuration of CloudM, we are able to carry out migrations of data (drive, emails, calendar events etc) reliably and efficiently. The platform is fast, easy to use, and very stable. Their documentation is also great!