Integrated functionality for instant messaging, presence, conferencing and voice.
Lync for Mac is included with every purchase of Office for Mac Standard 2011 for your business through Microsoft Volume Licensing.
Lync for Mac 2011 is the new rich client for Lync users on the Mac platform and offers integrated functionality for instant messaging, presence, conferencing and voice.
Lync for Mac is designed to work with both Lync Server 2010 and Lync Online to help you:

By simply looking at a contact name and the presence icon associated with that person, you can see whether a person is available, in a meeting, or out of the office so you can determine the best way to communicate with them.
Presence can display user status which can be set by a user or automatically based on calendar, login status, and more. Users can gain greater context with data such as published phone numbers and photos through a streamlined contact card experience.

Users can make computer-to-computer audio and video calls. They can also conduct conference calls by inviting multiple contacts to join the conversation or initiating a meeting from within Outlook for Mac 2011 or Lync for Mac 2011.

Lync for Mac makes it easy for users to make calls and access features during calls that streamline workflow for everyone.
* Some voice capabilities require Lync Server 2010 and are not available with Lync Online
Lync for Mac 2011 is fully compatible with Lync Server 2010 and Lync Online. Some features will not be fully functional with Lync Online including Voice options.
How does Lync for Mac 2011 compare?