I didn’t realise it was out yet, but Mastering Microsoft Lync Server 2013 by Keith Hanna and Nathan Winters (a friend and Exchange/Lync expert) is out.
You can get this nearly 900 pages book at:
.. as well as all good book stores and a few rubbish ones too.
In fact, I got two copies of the book directly from Sybex today. I hear that Nathan still hasn’t gotten his – poor timing with the house move, dude 
I want mine with autographs Something about that just makes them “Keep Worthy” even years later. Like some Hyper-V books I have laying around… : )