Secure Connectivity between Dynamics 365 (online) and Exchange Server (on-premises)

Hi,

Looking at secure communication between Dynamics 365 and Exchange 2013 On-premise.

Per MSDN document https://msdn.microsoft.com/library/office/dn626019(v=exchg.150).aspx

Exchange provides the following authentication options for you to choose from:

• OAuth

•  2.0 (Exchange Online only)

• NTLM (Exchange on-premises only)

• Basic (no longer recommended)

  
  
  I have Dynamics 365 Online (Cloud) and Exchange server 2013 Server (On-premise) need to integrate with Service Side Sync.

        How I can establish secure authentication in "Hybrid configuration" ?

Please advice

Thanks in advance

Avinash S