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POP3 and IMAP4 in Exchange 2016 • 6/7/2018 • 5 minutes to read • Contributors • • In this article Summary: Learn about support for POP3 and IMAP4 in Exchange 2016. Although users typically access their Exchange mailboxes by using Outlook (MAPI), Outlook on the web (formerly known as Outlook Web App), and Exchange ActiveSync, POP3 and IMAP4 are available in Exchange Server 2016. To support clients that still rely on these protocols, you need to start the services, and configure the settings for POP3 and IMAP4.
For detailed instructions, see the following topics: • • • After you enable and configure POP3 or IMAP4 on the Exchange server, you can enable or disable POP3 or IMAP4 access to specific mailboxes. For more information, see. 
Note: Clients connect to the POP3 and IMAP4 services in the Client Access (frontend) services on the Mailbox server. They never connect directly to the POP3 and IMAP4 backend services. For more information, see.
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POP3 and IMAP4 improvements in Exchange 2016 POP3 and IMAP4 functionality in Exchange 2016 is basically unchanged from Exchange 2013. These are the improvements in POP3 and IMAP4 as compared to Exchange 2010: • By default, the Client Access (frontend) services in Exchange 2016 automatically proxy POP3 and IMAP4 client connections from one Active Directory site to the correct Mailbox server in a different Active Directory site. In previous versions of Exchange, you had to perform a manual configuration step to allow POP3 and IMAP4 clients to connect to their mailboxes from one site to another. 
Le chateau ambulant vostfr movies. • You can't use the Anonymous or Guest accounts to access an Exchange 2016 mailbox by using POP3 or IMAP4.