While it's probably not many companies that works this way, and use Outlook, I do wonder what happens if your IMAP is on a closed network.
It is completely possible to have SMTP and IMAP be on internal networks and not on the internet (SMTP obviously needs a way to rely to a internet connected buddy).
It is completely possible to have SMTP and IMAP be on internal networks and not on the internet (SMTP obviously needs a way to rely to a internet connected buddy).