Lync for Mac 2011 has been released to manufacturing, and will soon be available through the Microsoft Office for Mac 2011 Volume Licensing SKU.
Starting in October, Mac customers can experience the same integrated communications that Lync PC users enjoy – including the ability to set up Lync conferences; use enterprise voice features; and use instant messaging and presence. 

For more information, read Kirk Gregersen’s blog post and visit the Lync for Mac website.