Change domain name


We are company A, but we have been bough by company B and now everybody in company B want to join O365.

Our onmicrosoft domain looks like and sharepoint, yammer too... Is there a way to change the name to or do we have to create a new account, and migrate our emails from our O365 account to the new one?



Hi JordiLores9339,

There is not an easy way to do the migration between the two different tenants. You can migrate them back to On-premises and then migrate them to another tenant or you can also refer to the following methods.

To move mailbox data from one tenant to another, there are two ways.
1. IMAP migration
For detailed information, please refer to the article below:
Migrate Email from an IMAP Server to Exchange Online Mailboxes
2. Use Outlook client to export/import the data as PST files:
Export or backup email, contacts, and calendar to an Outlook .pst file
Import email, contacts, and calendar from an Outlook .pst file

Note: The IMAP migration only moves user’s email messages, no calendar items or contacts. The second way can move these all, but it needs to be done for every user separately.

For SharePoint online, we also need to do a manually migration. Here are two threads for your reference:

Feel free to let us know if you anything is unclear or you need further assistance, we will continue to assist you.


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Question Info

Last updated January 28, 2020 Views 6,432 Applies to: