POP3 and IMAP4 in Exchange Online | Microsoft Learn
https://learn.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/pop3-and-imap4/pop3-and-imap4
WebNov 2, 2023 · To enable or disable POP3 and IMAP4 for individual users, see Enable or Disable POP3 or IMAP4 access for a user. To customize the POP3 or IMAP4 settings for a user, see Set POP3 or IMAP4 settings for a user. Note. If you've enabled security defaults in your organization, POP3 and IMAP4 are automatically disabled in Exchange Online.
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