Tenant with Multiple Domains

Daniel Bradbury 1 Reputation point

We have a tenant that contains a dozen or so domain names. Is there a tool / function available to automatically split this out into individual tenants either one-by-one or all at the same time?

Our concern is the time it would take to move individual emails from an existing to a new mailbox. Automation would be helpful.

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Joyce Shen - MSFT 16,421 Reputation points Microsoft Vendor

    Hi @Daniel Bradbury

    Do you have any on-premises servers like AD or Exchange server? Is your Office 365 tenant pure online?

    The original method provided is like the process introduced below: prepare a target Office 365 tenant and enough licenses. Then perform an mailboxes-migration across these two tenants. At last, add you own domain in the new tenant, and change all your users domain to your own domain; since after you migrate your users to the new domain, their domain will be changed to the new bought domain. Domain-change will be an indispensable process no matter how you perform the migration process.

    Here is the official document which introduces about How to migrate mailboxes from one Microsoft 365 or Office 365 organization to another

    If you'd like to perform it in other way rather than migration, Office 365 Import service could consider to be a workaround (use PST files to migrate): Overview of importing your organization's PST files

    Microsoft also provides a way called "FastTrack" which may be helpful to your scenario, detailed information here: Adopt Office 365 with FastTrack

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  2. Daniel Bradbury 1 Reputation point

    Thank you for your reply @Joyzhao-MSFT

    I appreciate your question and would like to clarify: we have a pure online tenant (Microsoft Office 365). No physical hardware.

    My hope was that perhaps we could avoid the longer process here: https://learn.microsoft.com/en-us/exchange/mailbox-migration/migrate-mailboxes-across-tenants

    ...and perhaps, use a tool that would automate some of the process from one online tenant to another as we seek to separate domains out of the existing tenant.

    I understand if there is no current solution. If that is the case, is there a potential plan in the next 12 months or less to introduce a tool for this?