What does the Azure AD registered device migration do?

• • It breaks the AD registered device settings. The computers are registered to the source device. This jointure needs to be broken in order to allow a registration into the new target tenant.
  • It breaks the Office licenses (Wold, Excell Powerpoint): Licenses are validated against the source tenant. After migration, the use of the source licenses need to be deleted. The next time that the user logins using his target credentials, Word and Excel will start using the target license.
  • It stops the synchronization of the OneDrive Sync Agent. After the migration of the user, the OneDrive Synchronization agent must not synchronize anymore with the source. By breaking the synchronization with the source, the next time the user logins, It will start synchronizing with the target.
  • It deletes the Outlook profile configuration. After migration, when the user starts outlook, he is prompted to enter his email address and a profile linked to the target mailbox is automatically created.

What does the Azure AD joined device migration do?

• • The device is unjoined from the source tenant.
  • The device is deregistered from the source Intune tenant.
  • As for the Entra registered devices, office licenses, OneDrive Sync Agent, Outlook profiles are removed
  • The Windows profile is migrated. After migration, the user logs with his target credentials but his Windows profile is preserved.
  • The computer is joined automatically to the target tenant
  • The computer is registered to the target Intune tenant.
  • BitLocker encryption keys are backed into the new tenant.