Email data migration between accounts within the same organization in Exchange Online

Question

(Machine translated Japanese text)

Issue

We have subscribed to Microsoft365 Business Premium and are using email via Exchange and Outlook.

Let's refer to this user as User A1 from Organization A.

Is it possible to create another user, User A2, within Organization A and migrate the email contents from User A1 to User A2?

Since there are no extra licenses available for Microsoft365 Business Premium, it is not possible to assign licenses to both User A1 and User A2 at the same time.

User A1 has invited User X1, who belongs to an external organization X, as a "member" to Organization A and has issued an account as User A1.

Background (Why there is such a migration issue)

When checking User A1 in the Entra Admin Center, the ID appears as "ExternalAzureAD," and occasionally it behaves differently from users newly created within Organization A, which has been a concern. (Even after setting up MFA authentication, a confirmation screen appears at login, mentions in Teams do not display, and it is not possible to invite external Teams users who are directly connected via B2B to a shared channel, etc.)

We have inquired with Microsoft Support about this issue in the past, and the response was that "the only solution is to create a new user within Organization A (not by invitation) and switch to using the newly created account."

To address these inconveniences and risks that seem unique to invited users, we would like to proceed with switching to the newly created user.

Answer 1

I understand that you would like to migrate the mailbox data between the mailboxes in same tenant.

To export the data in the mailbox into a PST file and import the PST file into the destiny mailbox is the easiest way.

You could use one of the three methods:

1. Compliance Center          Export Content search results | Microsoft Learn
2. Powershell New-ComplianceSearch

You could refer to this article for detailed steps: Export Office 365 Mailbox to PST (Step-by-Step-Guide) - Active Directory Pro

Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.

3. Outlook Export/Import

Export email, contacts, and calendar to a PST file

Import email, contacts, and calendar from a PST file