Hello,

We are currently thinking of migrating domain (internal.local), this domain has UPN suffix (external.local). UPN suffix is necessary for Office 365.

We would like to migrate to new domain (external.local), which is the same as UPN suffix used.

Is it possible? What is the best way to do this?

Thanks in advance,

Pteris

Hi,

We would like to migrate to new domain (external.local), which is the same as UPN suffix used.

Is it possible?

I assume that you have purchased the domain name external.local, and you want to keep using it for the new domain.

Technically, it is possible.

There are a few steps you will need to perform:

1. On the public DNS Server where the public domain name external.local record is hosted, change public IP address to the new DNS host of the new domain.
2. Delete stale domain information from the Manage Domains page of Office 365 portal.
3. Add new domain information from the same page.

Please note, only perform steps above after domain migration process is completed successfully.

More information for you:

Verify your domain in Office 365

https://support.office.com/en-us/article/Verify-your-domain-in-Office-365-6383f56d-3d09-4dcb-9b41-b5f5a5efd611

What is a domain and how do I use it in Office 365?

https://support.office.com/en-us/article/What-is-a-domain-and-how-do-I-use-it-in-Office-365-232d22cc-f4e3-4e1d-8445-2a4e9e848ebe?ui=en-US&rs=en-US&ad=US

Find your domain registrar or DNS hosting provider

https://support.office.com/en-us/article/Find-your-domain-registrar-or-DNS-hosting-provider-b5b633ba-1e56-4a98-8ff5-2acaac63a5c8?ui=en-US&rs=en-US&ad=US

If there are further queries regarding Office 365, please refer to Office 365 experts from this forum below:

Domains in Office 365

https://community.office365.com/en-us/f/155

Best Regards,