Prerequisites

Exchange Synchronizer supports these versions of on-premises Microsoft Exchange Server:

  • Microsoft Exchange 2007 with SP1 or a later SP
  • Microsoft Exchange 2010
  • Microsoft Exchange 2013
  • Microsoft Exchange 2016
  • Microsoft Exchange 2019

Exchange Synchronizer supports cloud-based Exchange Online.

Exchange Server must be enabled for Exchange Web Services using basic authentication.

Exchange Online must be enabled for Exchange Web Services or for Microsoft Graph using OAuth 2.0 authentication. Note that Exchange Web Services (EWS) is still supported, but Microsoft has indicated that EWS will be discontinued in 2026.

When using Exchange Online, push synchronization can only be supported if the LN UI endpoint URL is exposed to the internet. Push synchronization requires Exchange Online to access the notification service of Exchange Synchronizer across the internet.

Caution: 
If the LN UI endpoint URL is exposed to the internet, it is the customer's responsibility to ensure the desired level of application security. As a minimum, secure communications using HTTPS should be used. Additionally, a perimeter network or DMZ with, for example, reverse proxy may be used.