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When outlook 2016 hits release status, you will not be able to use it with your exchange mailbox unless/until autodiscover records are added.
I'm not exactly sure why they decided to remove the ability to manually add accounts, although it has something to do with mapi over http support and making it easier for end users. By using autodiscover, the account is correctly configured for mapi/http if it is supported. With mapi/http, Outlook uses an http url, not a server name. It also doesn't need the additional configuration for on the Connection tab.