Released today is the new Lync for Mac update. Only two items detailed as fixes where one of them is quite interesting.
Delegate doesn’t receive notification when you set delegation by using Lync for Mac 2011
Update enables Lync for Mac 2011 to run in Mac OS X Mavericks
** I thought it was always supported on Mavericks?
Get the link here http://support.microsoft.com/kb/2952672/en-us