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Autodiscover is required after Outlook 2016 for *all* Exchange deployments, whether on-prem or in cloud. I've written a lot of posts about the autodiscover service and how to work with it on my blog: <a href="https://acbrownit.com/?s=autodiscover" rel="ugc">https://acbrownit.com/?s=autodiscover</a>&nbsp;will show all of them, and you can go through at your leisure.
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Autodiscover is required after Outlook 2016 for *all* Exchange deployments, whether on-prem or in cloud. I've written a lot of posts about the autodiscover service and how to work with it on my blog: https://acbrownit.com/?s=autodiscover [https://acbrownit.com/?s=autodiscover] will show all of them, and you can go through at your leisure.

IT Admin

Damian Gardner

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ok good to know. &nbsp;readin them now. &nbsp;thanks Adam
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ok good to know.  readin them now.  thanks Adam

4 errors mentioned on the Autodiscover process

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Jackie Man

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Thanks guys for your help on this. &nbsp;Much appreciated!
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Thanks guys for your help on this.  Much appreciated!

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Hello - I am reading that an auto-discover record is required now for Outlook 2016/19 to connect to your Exchange Server. &nbsp;I need to understand if this pertains to BOTH Exchange Online AND Exchange Server (on prem)? or are they just meaning for Exchange ONLINE only, an autodiscover record is needed in DNS? &nbsp;The specify the format of the record as &quot;autodiscover.domain.com&quot;,<wbr /> which would only apply to Internet searches, and not within our internal network, correct? &nbsp;Looking for some clarification on this, as to what do I need for my clients on my network internally to find the Excahnge Server locally. &nbsp;<br />
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Thank you,<br />
Damian
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Hello - I am reading that an auto-discover record is required now for Outlook 2016/19 to connect to your Exchange Server.  I need to understand if this pertains to BOTH Exchange Online AND Exchange Server (on prem)? or are they just meaning for Exchange ONLINE only, an autodiscover record is needed in DNS?  The specify the format of the record as "autodiscover.domain.com", which would only apply to Internet searches, and not within our internal network, correct?  Looking for some clarification on this, as to what do I need for my clients on my network internally to find the Excahnge Server locally.  

Thank you,
Damian

When is an AUTO-DISCOVER record necessary?

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.

Outlook

The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other resource into an IP address for connecting to the Internet or a private network. Most prominently, it translates domain names to the numerical IP addresses needed for the purpose of computer services and devices worldwide.