May 25th, 2018 
Kapuwa In case you run into slow account setup with Outlook 2016, which can take up to 10 mins or more. To workaround this issue, you may use the following Registry settings to force Outlook to bypass the root domain discovery and redirect to the autodiscover CNAME or A record to resolve the address for autodiscover settings.
For Outlook 2016:
| Windows Registry Editor Version 5.00 [HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Outlook\AutoDiscover] “ExcludeHttpsRootDomain”=dword:00000001 |
Note: For Office PC that has joined the Microsoft Active Directory, there is no need to amend the registry. This setting will be applied via the group policy when you login the system. and make sure Exchange Internal auto discovery DNS Entries are already created to auto discover internal Exchange Server
More Information Available at http://www.mistercloudtech.com/2015/12/08/how-to-resolve-slow-office-2016-autodiscover-with-office-365/
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