POP3 For Microsoft 365 Business Account

Question

Hi, had a client trying to setup POP3 with Outlook but with Basic deprecated, is POP3 with Modern Auth in Outlook for Windows with an M365 Business account supported? I don't seem to be able to connect to POP3 using Outlook at all.

Answer 1

Hi @Raymond Brooks,

Thank you for reaching out and asking about using POP3 in Outlook with a Microsoft 365 Business account. We would like to provide the official information from Microsoft as follows:

• POP3 with Modern Authentication is not supported in Outlook on Windows.
• Since late 2022, Microsoft has ended support for Basic Authentication for Exchange Online. Therefore, Outlook on Windows cannot connect via POP3 without Basic Auth.
• Although Exchange Online now supports OAuth 2.0 for POP3/IMAP, Outlook does not support OAuth for these protocols with regular accounts.
• Microsoft has confirmed: “There are no plans for Outlook to support OAuth for POP and IMAP.”

To ensure stable and secure connectivity, we recommend:

• Using native Exchange connection in Outlook: Simply add your Microsoft 365 account using your email address, and Outlook will automatically use the Exchange protocol (MAPI/EWS) with Modern Authentication. You’ll have full access to email, calendar, contacts, and advanced features.

Notes on Limitations

• Outlook does not support multi-factor authentication (MFA) with POP/IMAP.
• The new Outlook (One Outlook) does not support POP accounts.
• SMTP Auth with Basic Auth will be fully deprecated by April 2026.

If you need further assistance or have additional questions, please feel free to contact us again.

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