A Tenant to Tenant Migration with Coexistence project is unique in MigrationWiz. While the overall process is no different from any other migrations, this specific type of migration does the extra setup to establish the coexistence link between the Source and Destination tenants.
After following the steps in the Office 365 Tenant to Tenant Coexistence Project Setup Guide MigrationWiz will perform several actions in the background on both the source and destination to prepare the users for coexistence. Note: This process is done automatically, there is no need for any actions to be done manually.
- Once the project is saved, MigrationWiz automatically opens both endpoints, connects to Azure Active Directory, and starts to configure the Office 365 tenants for the project. This process can take up to one hour per 1000 users.
- Organizational Sharing and Individual Sharing are set up and enabled on the source and destination tenants; Free/Busy between the tenants.
- Users are discovered in the source tenant and mail contacts are created with an external email address of the primary domain on the destination tenant for the users. This will allow for reverse free/busy look up from the destination to the source as well as enable mail routing from the destination to the source.
- Once the automatic process is finished, the users are imported into the MigrationWiz project. The users are now ready to have User Migration Bundle licenses applied. See Apply User Migration Bundle licenses to the Customer's Users for steps on applying licenses.