Since is always an hassle finding the right Information on Microsoft Webpage about Lync 2013, there is an entry point where you are able to step into as portal.
Microsoft has listed all important Links, sorted and well documented, so it's easy to navigate to the necessary Information quickly.
Lync 2010:
http://technet.microsoft.com/en-us/lync/gg427635
Lync 2013:
http://technet.microsoft.com/en-us/lync/fp123621
As well as the Interoperability Program:
http://technet.microsoft.com/en-us/lync/gg236602
Microsoft has listed all important Links, sorted and well documented, so it's easy to navigate to the necessary Information quickly.
Lync 2010:
http://technet.microsoft.com/en-us/lync/gg427635
Lync 2013:
http://technet.microsoft.com/en-us/lync/fp123621
As well as the Interoperability Program:
http://technet.microsoft.com/en-us/lync/gg236602