Assign permissions for migration in Exchange Online

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In the second part of the six-part email migration from on-premises Exchange server to Exchange Online series, we will be discussing about assigning the necessary permissions to access and sometimes modify the mailboxes during migration. To migrate the mailboxes, the user account of the migration admin with which you would connect to your on-premises Exchange server, needs certain permissions along with the administrative privileges in your on-premises Exchange server.

Administrative privileges required during the following types of migration:

  1. Staged migrationDomain Admin in Active Directory Domain Services (ADDS) (or) FullAccess and WriteProperty permissions (or) Receive As and WriteProperty permissions for all on-premises mailboxes.
  2. Cutover migrationDomain Admin in Active Directory Domain Services (ADDS) (or) FullAccess permission (or) Receive As permission for all on-premises mailboxes.
  3. Hybrid migrationDomain Admin in Active Directory Domain Services (ADDS) (or) a member of Exchange Recipients Administrators group (or) a member of Organization Management or Recipient Management group in the Active Directory.

You can use Exchange Online PowerShell in your on-premises organization to assign the necessary permissions. Given below are few example PowerShell cmdlets that can be used to assign on-premises mailboxes permissions to the migration admin’s user account to get you started.

  1. Full Access Permission –

    Eg.Get-Mailbox -ResultSize unlimited -Filter "RecipientTypeDetails -eq‘usermailbox’” | Add-MailboxPermission -User migrationadmin -AccessRightsFullAccess -InheritanceType all

    This cmdlet assigns FullAccess permissions of all user mailboxes to the migration admin account.

  2. Receive As Permission –

    Eg.Add-ADPermission -Identity "user mailbox" -User migrationadmin -ExtendedRights receive-as

    This cmdlet assigns Receive As permission of user mailbox to the migration admin account.

  3. WriteProperty Permission –

    Eg.Get-User -ResultSize unlimited -Filter "RecipientTypeDetails -eq ‘UserMailbox’" | Add-ADPermission -User migrationadmin -AccessRightsWriteProperty -Properties TargetAddress

    This cmdlet assigns WriteProperty permission of all user mailboxes to the migration admin account for modifying the target address attributes.

After assigning these permissions you can migrate the mailboxes.

M365 Manager Plus, a comprehensive Microsoft 365 reporting, management, monitoring, auditing, and alerting tool, helps you to keep track of the migration process by offering pre-defined and intuitive reports. It provides reports on Exchange server to Exchange Online migration statistics and users. Follow the steps given below to generate migration statistics report using M365 Manager Plus.

  1. Click on the Reports tab.
  2. Navigate to Exchange Online > Mailbox Reports > General Mailbox Reports.
  3. Choose the Migration Statistics report.
  4. Select the corresponding Microsoft 365 Tenant.
  5. Click on Generate Now.

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