Kolab Activesync: unable to configure Outlook 2016 using Exchange

[Adi Pircalabu]

Hi, using CentOS 7 with:
kolab-16.0.1-12.2.el7.kolab_16.x86_64
kolab-syncroton-2.3.12-1.13.el7.kolab_16.noarch
I'm trying to use activesync with Outlook 2016, without success so far. 
Outlook user-agent logged is:
"Microsoft Office/16.0 (Windows NT 10.0; Microsoft Outlook 16.0.10730; 
Pro)"

This is what Outlook 2016 is sending:
<?xml version="1.0" encoding="utf-8"?><Autodiscover 
xmlns="http://schemas.microsoft.com/exchange/autodiscover/outlook/requestschema/2006"><Request><EMailAddress>user at domain.com.au</EMailAddress><AcceptableResponseSchema>http://schemas.microsoft.com/exchange/autodiscover/outlook/responseschema/2006a</AcceptableResponseSchema></Request></Autodiscover>

And this is kolab's response:
---CUT HERE---
<?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">
     <User>
       <DisplayName>Test User</DisplayName>
       
<AutoDiscoverSMTPAddress>user at domain.com.au</AutoDiscoverSMTPAddress>
     </User>
     <Account>
       <AccountType>email</AccountType>
       <Action>settings</Action>
       <Protocol>
         <Type>IMAP</Type>
         <Server>pop3.domain.com.au</Server>
         <Port>993</Port>
         <LoginName>user at domain.com.au</LoginName>
         <SPA>off</SPA>
         <Encryption>SSL</Encryption>
       </Protocol>
       <Protocol>
         <Type>POP3</Type>
         <Server>imap.domain.com.au</Server>
         <Port>995</Port>
         <LoginName>user at domain.com.au</LoginName>
         <SPA>off</SPA>
         <Encryption>SSL</Encryption>
       </Protocol>
       <Protocol>
         <Type>SMTP</Type>
         <Server>smtp.domain.com.au</Server>
         <Port>465</Port>
         <LoginName>user at domain.com.au</LoginName>
         <SPA>off</SPA>
         <Encryption>SSL</Encryption>
       </Protocol>
     </Account>
   </Response>
</Autodiscover>
---CUT HERE---

The IMAP / POP3 / SMTP settings are ok, yet outlook comes up with a 
"Something went wrong" window. Where else should I look to make it work?
Thanks,

-- 
Adi Pircalabu