Outlook supports the standard IMAP, POP, and SMTP protocols. If you’re trying to add your Outlook.com account to another mail app, you might need the POP, IMAP, or SMTP settings for Outlook.com.

If you want to add your Outlook.com account to a smart device like a home security camera, you’ll need an app password. To learn more, see Add your Outlook.com account to another mail app or smart device.

Incoming Settings

The IMAP server is outlook.office365.com (or imap-mail.outlook.com) and it is using the port 993. (Requires TLS)

The POP server is outlook.office365.com (or pop-mail.outlook.com) and it is using the port 995. It requires TLS.

  • If you want to use POP to access your email in Outlook.com, you’ll first need to enable POP access.

    1. Select Settings Settings > View all Outlook settings > Mail > Sync email.
    2. Under POP and IMAP, select Yes under Let devices and apps use POP.
    3. Select Save.

Outgoing Settings

The outgoing SMTP server is  smtp.office365.com (or smtp-mail.outlook.com), and it is using the port 587 it requires STARTTLS.

source: Microsoft