Enable Cross-Tenant EWS Access


Migration of mailboxes using administrative credentials to ​Exchange Server 2010 deployed in multi-tenant mode may fail with the error "The SMTP address has no mailbox associated with it" because the admin account is unable to look up the mailbox.

In order to migrate with a single set of administrative credentials within an Exchange 2010 multi-tenant environment, create a new management role granting access.

To grant access to an administrative migration account called "MigrationWiz":

  1. Open the Exchange Management Shell.
  2. Enter the following commands:

    New-ManagementScope -PartnerDelegatedTenantRestrictionFilter {Name -eq '*'} -Name MigrationWizScope
    New-ManagementRole -Parent PartnerDelegatedTenantManagement -Name MigrationWizRole
    New-ManagementRoleAssignment -Role MigrationWizRole -User MigrationWiz -CustomConfigWriteScope MigrationWizScope


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