With the (Sept/2010) release of the Communicator 2011 for Mac client and with the release of Lync 2010 (that replaces OCS 2007 for instant messaging, web conferencing, and VoIP), Apple Mac users now have near feature parity as Windows users.
With the new '2010' release of products, Apple Macs are finally reaching parity in terms of features / functions / support! Take for example Exchange 2010, Mac users get the same Outlook Web Access capabilities when they use Apple Safari browser as Windows users running Internet Explorer (drag, drop, etc), and same for Sharepoint 2010 Mac users get the same functionality in document libraries, lists, etc as Windows users do. For the longest time, Apple Mac users have been 2nd class citizens in a Microsoft network and application world.