Although Exchange Server 2016 includes several new features and functionalities, some features are discontinued or de-emphasized because they are replaced with newer technologies.
The following Exchange Server 2010 features are discontinued:
- The UM server role is replaced by UM services running on the Mailbox server role.
- The Hub Transport server role is now replaced by transport services.
- Exchange Management Console and Exchange Control Panel are both discontinued.
- Support for Microsoft Office Outlook 2003 and RPC over Transmission Control Protocol (RPC/TCP) client access is discontinued.
- 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 is discontinued.
- Managed folders have been replaced with retention tags and retention policies.
The following Exchange Server 2013 features are discontinued in Exchange Server 2016:
· The Client Access server role is now integrated into the Mailbox server role.
· The MAPI over Collaboration Data Objects (MAPI/CDO) library is replaced by Exchange Web Services, Exchange ActiveSync, and representational state transfer (REST) application programming interfaces (APIs).
The following features are de-emphasized, 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
· Other organizations’ replication APIs
Additional Reading: For more information, refer to What's discontinued in Exchange 2016: http://aka.ms/Upk34z