![]() Can only download messages from a single folder (usually the Inbox) in the mailbox to a single folder in the POP3 application on the client computer or device.Designed for offline message processing.Overview of POP3 and IMAP4 functionality The POP3 and IMAP4 protocols have the following benefits and limitations: This limitation was intentionally included in Exchange 2016 to enhance security for the Administrator mailbox. You can't connect to the Administrator mailbox by using POP3 or IMAP4 (you can use Outlook or Outlook Web App).Access is blocked to prevent security vulnerabilities when you use non-standard accounts for POP3 and IMAP4 access. You can't use the Anonymous or Guest accounts to access an Exchange 2016 or Exchange 2019 mailbox by using POP3 or IMAP4. ![]() ![]() 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.
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January 2023
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