Autodiscover

Question

Hello,
I have a question regarding the configuration of the autodiscover service.
My infrastructure is full hybrid with a 2016 exchange server on premise.
I have already moved the mail flow to o365 by changing the mx record and moving all the mailboxes
The on premise server is used as an smtp relay.
Currently my dns record, both on public and private dns, for autodiscover service points to the exchange on premise server and everything works.
Reading the microsoft article https://learn.microsoft.com/en-us/exchange/decommission-on-premises-exchange I am in scenario 3.
The article says If you were to even start the process by pointing the Autodiscover Records to Exchange Online, you would immediately break some features like hybrid public folder access.
I don't use public folder but I only use the on premise server as smtp relay.
So I can't point the autodiscover to the microsoft records autodiscover.outlook.com?
If I don't move my autodiscover record to autodiscover.outlook.com the exchange server on premise should be unavailable what happens?
Outlook clients will not be able to connect to o365?

Thank you

Regards

Answer 1

If you have moved ALL the mailboxes to Office 365 and have no Public Folders, then yes change the autodiscover record to Office 365.

The SMTP relay is not related to the AutoDiscover record, so that won't be affected.

If you are using Outlook 2016 and above, Autodiscover is optimized by default to check for the mailbox in Office 365!

https://support.microsoft.com/en-us/help/3211279/outlook-2016-implementation-of-autodiscover

Answer 2

Thank you for your answer