For more information, see POP3 and IMAP4 in Exchange Server. However, you may find that some services must be configured to use unencrypted web connections on 80/TCP to the Client Access services on Mailbox servers. Whenever possible, we recommend using encrypted web connections on 443/TCP to help protect data and credentials. Autodiscover (fallback when 443/TCP isn't available).Outlook on the web (redirect to 443/TCP).Unencrypted web connections are used by the following clients and services: Offline address books in Exchange Server.Autodiscover service in Exchange Server.Outlook on the web (formerly known as Outlook Web App)įor more information about these clients and services, see the following topics:. ![]()
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