I have had Lync 2013 x64 on my PC for a few months now, and it seems to crash ALOT. Usually after making a phone call, when there is an IM window open.
I have reinstalled a few times - the below is from the Application Event Log:
Faulting application name: lync.exe, version: 15.0.4551.1005, time stamp: 0x525f9026
Faulting module name: unknown, version: 0.0.0.0, time stamp: 0x00000000
Exception code: 0xc0000005
Fault offset: 0x0000000002560055
Faulting process id: 0xf8c
Faulting application start time: 0x01cef17bbb5cebdf
Faulting application path: C:\Program Files\Microsoft Office\Office15\lync.exe
Faulting module path: unknown
Report Id: 36a10196-5d71-11e3-9a69-083e8ee10280
Taylor Nelson