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:

HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\AutoDiscover

Here you can use the following entries (as mentioned here or here):

PreferLocalXML
ExcludeHttpRedirect
ExcludeHttpsAutodiscoverDomain
ExcludeHttpsRootDomain
ExcludeScpLookup
ExcludeSrvRecord
ExcludeLastKnownGoodURL (only applies to Outlook 2010 version 14.0.7140.5001 and later versions)
ExcludeExplicitO365Endpoint (only applies to Outlook 2016 version 16.0.6741.2017 and later versions)
 
Some documentation states that the ExcludeSrvLookup value is used by Outlook in this scenario. Unfortunately, this documentation is incorrect (as written here) as the ExcludeSrvLookup value does not exist in Outlook code.
 
The values (dword) can have the following values: 0 = enabled, 1 = disabled.
 
If you wish to control Outlook AutoDiscovery by using Group Policy see KB 2612922

To learn how to disable AutoDiscovery fully on a MAC running MS Office click here.

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