Network Monitor (Netmon) Parsers for Lync
Microsoft have released Network Monitor Parsers for Lync download them here
You can download Microsoft Network Monitor 3.4 here
I found I also needed the parser filters from codeplex to get the Lync parsers to install, you can get them here
I must admit, I’m usually a wireshark guy. Here are some useful links to get you started with Netmon.