Learn how Outlook 2016 uses Autodiscover to obtain configuration information for servers to which it connects. See the steps, timing, efficiency, and policy control of the Autodiscover process for Exchange servers.

A CNAME record is needed for Outlook to configure the account using Autodiscover. The only record you need to add is for Host Autodiscover. Verify that your MX record is still configured for Hotmail. An MX record ensures you can receive email from other people.

Cause. After the mailbox move is completed, Exchange Server 2013 or 2016 continues to proxy the autodiscover request to Exchange Server 2010. Exchange Server 2010 responds with a 302 redirect back to Exchange Server 2013 or 2016 (depending on the upgrade).

Error: IMAP Autodiscover Failed. For most popular email providers that offer IMAP/SMTP, the Outlook service already knows the correct IMAP server settings. If we don't know the correct settings, the service tries to discover them, but it doesn't always succeed. In this case, you should contact your email service provider to get the IMAP server ...

When a user or administrator tries to access a website (for example, Outlook Web App (OWA), Exchange Control Panel (ECP), Autodiscover and so on) through the Client Access services (CAS), an unhandled exception occurs. Cause. This issue occurs because the single label domain isn't correctly handled in forest name validation. Resolution

When Outlook 2016 client connects to Exchange Server by using Autodiscover service with Exchange ActiveSync (EAS), it does not use the MAPI/HTTP protocol that sends an anonymous HTTP request, as expected. Instead, it initially tries to do BASIC authentication by using an account without a password.