Lync clients logs path

Lync 2013 Desktop 

C:\Users\\AppData\Local\Microsoft\Office\15.0\Lync\Tracing

Lync 2010 Desktop  

C:\Users\\Tracing

AppStore Lync Client

C:\Users\\AppData\Local\Packages\Microsoft.LyncMX_8wekyb3d8bbwe\ LocalState\Tracing\LyncImm-Lync-0.Lynclog

LWA plug-in 

C:\users\\AppData\Local\Microsoft\LWAPlugIn\Tracing