Actually, an Office 365 Exchange Online mailbox supports POP connection, which means you can configure this mailbox via POP on your Outlook client. However, based on my understanding from your description, you’d like to have a shared POP mailbox which can be
accessed and used by multiple users. Is this correct? If yes, please be aware that an Exchange Online shared mailbox cannot be accessed via POP connection. It needs to be a normal user mailbox.
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