Deprecated features in SharePoint Server 2016

Following features have been deprecated\removed in SharePoint Server 2016

1) Duet Enterprise for Microsoft SharePoint
Duet Enterprise for Microsoft SharePoint and SAP cannot be deployed with SharePoint Server 2016.
Note: For deploying Duet Enterprise for Microsoft SharePoint you must use SharePoint Server 2013 Enterprise Edition.

2) SharePoint Foundation
SharePoint Foundation is no longer available in the SharePoint Server 2016 release.
Note: Previous releases of SharePoint Server included SharePoint Foundation, a free edition of SharePoint that included most of the core functionality and architecture provided by the commercial editions of SharePoint.

3) Standalone Install mode
SharePoint Server 2016 doesn't support the standalone install option, so it is no longer available in the setup program.
Note: Use the MinRole during installation and choose one of the available install options. The Single Server Farm option where everything is installed on the same computer is supported for dev/test/demo purposes. When you use this option, you must install SQL Server yourself and then run the SharePoint Server 2016 farm configuration wizard.

4) ForeFront Identity Manager client (FIM)
SharePoint Server 2016 no longer uses FIM as the synchronization client.
Note: Earlier versions of SharePoint used ForeFront Identity Manager client (FIM) to synchronize between Active Directory and SharePoint.  The default process is Active Directory Import. You can also use any synchronization tool such as Microsoft Identity Manager 2016, or any third-party tool.

5) Excel Services in SharePoint
Excel Services and its associated business intelligence capabilities are no longer hosted on SharePoint Server.
Note: Excel Services functionality is now part of Excel Online in Office Online Server (this is the next version of Office Web Apps Server), and SharePoint users can use the services from there.
If you currently use Excel Services in SharePoint 2013 and upgrade to SharePoint Server 2016 you must also deploy Office Online Server with Excel Online to ensure Excel Services functionality remains available.

6) SharePoint BI capabilities
The SQL Server 2014 Power Pivot and Power View add-ins for SharePoint Server 2016 cannot be deployed or used in SharePoint Server 2016.
Note: To deploy these add-ins you need to upgrade to SQL Server 2016 CTP 3.1.

7) Tags and Notes
The Tags and Notes feature is deprecated in SharePoint Server 2016.
Note: Users can still create new tags and notes and access any existing ones. It's recommend not to use this feature because it is expected to be removed in the next release. Administrators can archive all existing tags and notes by using the Export-SPTagsAndNotesData cmdlet.

8) Stsadm.exe tool
The Stsadm command-line tool has been deprecated, but it is included to support compatibility with previous product versions.
Note: Windows PowerShell must be used to perform command-line administrative tasks.

Hope this post will be helpful for you!