I have a new client with an exchange 2007 server that is new to me. Client called in initially with a mac with outlook 2011 no longer able to connect after the installed generic windows updates on the server. Upon inspection, we discovered that the environment had never really been setup properly, and all of the local windows desktops were configured to connect with local paths and credentials, although OWA was working externally. We resolved an issue with RPC and the setup now passes the exchange connectivity analyzer. I can also connect with an iphone, although I do have to manually input the server address. I cannot however connect an outlook client, windows or mac, outside of the office. Windows clients can connect locally inside the office, and OWA works inside or outside. Mac outlook client cannot connect locally or otherwise. Outlook setup externally appears to go through and leads to a username/password prompt, but now combination of user/pass, with domain included or not, is accepted. Credentials have been verified as they allow access via OWA. I'm seeing zero errors in the event viewer since resolving the rpc error initially. I'm out of ideas as to what could be causing this, since the connectivity analyzer gives a green light.