Abstract: Sometimes it is required to speed up the Exchange/Outlook AutoDiscovery. This can be controlled via some registry keys.
Browse the following registry string:
Here you can use the following entries (as mentioned here or here):
ExcludeExplicitO365Endpoint (only applies to Outlook 2016 version 16.0.6741.2017 and later versions)
To learn how to disable AutoDiscovery fully on a MAC running MS Office click here.