![]() The primary email address for the new users must be the source domain.One should also activate new users in the target domain as well as assign new licenses.If one uses Active Directory Federation Services (AD FS), one has to configure a new domain in the target tenant for AD FS.One should ensure to initiate this step one hour after performing the previous actions. The final step is preparing the target domain by verifying the source tenant in the target domain.Ensure erasure of all objects from the primary mail domain in the source tenant before the transfer of Office 365 mailbox to another account.It becomes easy because of the noting down of the lowest value of TTL on the MX record. Change the primary MX record to an unreachable value to stop the flow of inbound mail to the source tenant.The next step is to disable the directory sync for the source tenant.Note down the lowest value of Time To Live (TTL) on the Mail Exchanger (MX) record of the primary email domain.The first step involves generating a list of user mailboxes for migration and creating a CSV file for mapping.It will now take around 72 hours for the change to take effect. However, one should ensure that the domain is in use for only one target tenant lest the verification process should fail. The addition of a source domain in the admin center of the target Office 365 and the creation of TXT records in DNS have to be performed.Commence the process of verifying the target tenant domain in Office 365.The final step of the domain preparation stage is to train the end-users on how to use Office 365 post-migration.The synchronization of the source and the target domain is the next step to follow. At times, performing Active Directory Domain Services (AD DS) consolidation using AD DS tools might be necessary. ![]()
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