We have added a new Exchange 2003 server into an existing administrative group. We have created a few test mailboxes on the new server using Active Directory Users and Computers. However when I try to open one of these mailboxes whilst logeed in as me I get asked for a user name and password. My acount can open mailboxes on any other server in the domain, including the other server in the same administrative group. If we login as the actual person then we can open these mailboxes no problem. It is only when logged in as an administrator we cannot do it.