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Firstly, create a text file containing the following:
<?xml version="1.0" encoding="utf-8"?>
<Autodiscover xmlns="http://schemas.microsoft.com/exchange/autodiscover/responseschema/2006">
<Response xmlns="http://schemas.microsoft.com/exchange/autodiscover/outlook/responseschema/2006a">
<Account>
<AccountType>email</AccountType>
<Action>redirectUrl</Action>
<RedirectUrl>https://autodiscover-s.outlook.com/autodiscover/autodiscover.xml</RedirectUrl>
</Account>
</Response>
</Autodiscover>
Save the file somewhere on the PC that's running Outlook 2016 Preview. It's probably worth putting it somewhere you can remember and giving it a name that tells you what it is so you don't delete it later.
Next open regedit. Navigate to 'HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Outlook\AutoDiscover'
Create a new 'string value' called whatever your email domain name is i.e. 'businessname.com' - no quotes.
Double click the new value and enter the path to the file you just created. Again, no quotes.
Next create a 'DWORD value' called 'PreferLocalXML' - no quotes.
Double click the new value and give it a value of 1.
Now try Outlook 2016 Preview again.
I found decision:
- I found Sample Exchange Autodiscover Local XML File at https://gallery.technet.microsoft.com/office/Sample-Exchange-Autodiscove-263028b4
- The line <RedirectUrl>https://autodiscover-s.outlook.com/autodiscover/autodiscover.xml</RedirectUrl>
must be <RedirectUrl>https://your_own_cas_server_name/autodiscover/autodiscover.xml</RedirectUrl>
- The file must be .xml not .txt. So I renamed 1.txt to 1.xml
- Start Outlook 2016