Following Doc links have information about what inputs need to be enabled for 2016.
Inputs :
http://docs.splunk.com/Documentation/MSExchange/3.5.0/Add-Ons/TA-ClientAccessinputs
http://docs.splunk.com/Documentation/MSExchange/3.5.0/Add-Ons/TA-Mailboxinputs
http://docs.splunk.com/Documentation/MSExchange/3.5.0/Add-Ons/TA-Exchange-IISinputs
You can refer following links to know How to configure those inputs
http://docs.splunk.com/Documentation/MSExchange/3.5.0/Add-Ons/ConfigureTA-ClientAccess
http://docs.splunk.com/Documentation/MSExchange/3.5.0/Add-Ons/ConfigureTA-Mailbox
http://docs.splunk.com/Documentation/MSExchange/3.5.0/Add-Ons/ConfigureTA-Exchange-IIS
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