Remove Migrated Mailboxes from Exchange 5.5
After you migrate mailboxes from Exchange 5.5 to Exchange 2000, remove the migrated mailboxes from Exchange 5.5.
Important Before you remove migrated mailboxes from Exchange 5.5, verify that the migration was successful and that directory information and mailbox content for the migrated mailboxes are available on Exchange 2000.
To remove migrated mailboxes from Exchange 5.5:
Warning If Are you sure you want to delete the primary Windows NT account? appears, and you are not sure that you are deleting the correct Windows NT account, click No.