Setting up third party email to sync on new Outlook

Chandrika D'Mello 0 Reputation points
2026-08-21T08:23:50.32+00:00

I am running Windows 11 and have a Microsoft 365 subscription. I have been using Outlook classic for a while now and wanted to switch to new Outlook. I have been having endless issues. When I use the email account password, it loads the account but brings in very old email folders and not all the most recent emails appear in the inbox. I then deleted the account completely and tried again. My domain provide told me to enable two factor authentication on the webmail (which I did) and use the password generated by the webmail. I did that too but it would not even get past the login screen after having input the incoming/outgoing server details etc supplied by my domain provider.

I am now at a loss at what to do. Do I simply have to go back to Outlook classic? Is Microsoft ever going to fix this issue?

Outlook | Windows | New Outlook for Windows | For home

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  1. AI answer

    2026-08-21T08:24:13.1866667+00:00

    Yes—going back to classic Outlook is the practical path for this scenario.

    What the available guidance supports:

    1. New Outlook can have limitations with some third-party accounts New Outlook supports adding common account types, but some non-Microsoft providers require changes on the provider side before they can be added. Similar support guidance also indicates that many third-party or custom-domain accounts may not work reliably in new Outlook, while classic Outlook supports manual POP/IMAP setup.
    2. If the provider requires an app password, that password must be used in Outlook For some account types such as IMAP, the provider-generated app password is required instead of the normal mailbox password. That aligns with the two-factor authentication step already completed.
    3. Classic Outlook is the supported fallback when manual server setup is needed If automatic setup fails, classic Outlook allows manual setup:
      • Open classic Outlook
      • Select File > Add Account
      • Enter the third-party email address
      • Select Advanced options > Let me set up my account manually
      • Choose POP or IMAP
      • Enter the incoming and outgoing server settings from the domain provider
      • Use the provider-generated app password if required
    4. Manual setup is specifically documented for classic Outlook, not new Outlook The documented advanced setup flow for entering server names, ports, and SSL settings is for classic Outlook for Windows.
    5. If folders or recent mail are missing in classic Outlook, verify the account type and settings Microsoft’s troubleshooting guidance says missing synced folders or messages can happen when the wrong account type is used. If needed, the server, port, SSL, username, and password can be reviewed in Control Panel > Mail > Email Accounts > select the account > Change.

    About whether this will be fixed:

    • The available material does not provide a product commitment or timeline for a fix in new Outlook.
    • It does show that Microsoft documents manual POP/IMAP configuration in classic Outlook and that some third-party providers need extra provider-side requirements such as app passwords.

    Recommended next step:

    • Use classic Outlook for this mailbox if it is a custom-domain or other third-party account that needs manual IMAP/POP settings.
    • Use the exact server settings from the domain provider and the generated app password if two-factor authentication is enabled.
    • If recent mail or folders still do not appear, recheck the account type and the incoming/outgoing settings in Mail in Control Panel.

    References:

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