> **Note**
>
-> The Classic UI feature named `Command Expander` does not work with Icinga 2.
+> The Icinga 1.x feature named `Command Expander` does not work with Icinga 2.
#### Environment Macros <a id="differences-1x-2-environment-macros"></a>
* Service A should notify contact X via SMS
* Service B should notify contact X via Mail
* Service C should notify contact Y via Mail and SMS
-* Contact X and Y should also be used for authorization (e.g. in Classic UI)
+* Contact X and Y should also be used for authorization
The only way achieving a semi-clean solution is to
### Logging <a id="differences-1x-2-logging"></a>
Icinga 1.x supports syslog facilities and writes its own `icinga.log` log file
-and archives. These logs are used in Icinga 1.x Classic UI to generate
+and archives. These logs are used in Icinga 1.x to generate
historical reports.
Icinga 2 compat library provides the CompatLogger object which writes the icinga.log and archive
-in Icinga 1.x format in order to stay compatible with Classic UI and other addons.
+in Icinga 1.x format in order to stay compatible with addons.
The native Icinga 2 logging facilities are split into three configuration objects: SyslogLogger,
FileLogger, StreamLogger. Each of them has their own severity and target configuration.