Communicator 2007 r2 Mac Client

Hello, 

Im trying to setup a mac on our network and we currently use office communicator 2007 r2.   The verion of offices I'm installing on the mac is 2011 and it in turn installs Lync client.  I am unable to find the office communicator 2007 r2 client for the mac.  

Could anyone pleas let me know what I have to do to get this mac to connect to our communicator 2007 r2 server. 

Thanks,

Rob