I’m dealing with a company that has a headquarter overseas and branches in several countries. The company insists on having all mailboxes located in the HQ, and all users have the same @domain.com addresses. I’m concerned when the remote site I’m managing has plenty of users (>100 very soon) with all incoming mail is delivered to the HQ and the users sending-receiving their email to the remote Exchange server over a site-to-site tunnel. What’s the best practise in this case? Does it help to install a local hub transport server? Any solid argument to convince the company to move mailboxes to local Exchange servers? I’d appreciate any expert suggestions.