Although Exchange Server 2019 includes several new features and functionalities, some features are discontinued or de-emphasized because they are replaced with appropriate new technologies.The following Exchange Server 2010 features are discontinued:
- The Unified Messaging server role, which is replaced by Unified Messaging services running on the Mailbox server role
- The Hub Transport server role, which is now replaced by transport services
- Exchange Management Console and Exchange Control Panel
- Support for Microsoft Office Outlook 2003 and RPC over TCP client access
- Outlook Web App no longer offers built-in spell check. Instead, spell check now works in the web browsers.
- Outlook Web App no longer supports custom date on a message flag and customizable filtered views.
- Anti-spam agent management in the Exchange Management Console
- Managed folders, which are replaced with retention policies
The following Exchange Server 2013 features are discontinued in Exchange Server 2016:
- The Client Access server role, which is now integrated with the Mailbox server role.
- The MAPI over CDO library, which is replaced by Exchange Web Services, Exchange ActiveSync, and representational state transfer (REST) application programming interfaces (APIs).
The following features are deemphasized, which means that they will not be used in future Exchange Server versions:
- RPC over HTTP, because it is being replaced with MAPI over HTTP
- Database availability group support for failover cluster administrative access points
- ThirdPartyReplication parameter on the Database availability group
The following Exchange Server 2016 features are discontinued in Exchange Server 2019:
- Unified Messaging has been removed from Exchange 2019. We recommend that Exchange 2019 organizations transition to Skype for Business Cloud Voice Mail.
The following features are being de-emphasized in Exchange 2019 and may not be included in future versions of Exchange.
- Third-party replication APIs
- RPC over HTTP
- Database availability group (DAG) support for failover cluster administrative access points