I gotta believe there is a port that needs to be opened:
1. Client PC is Windows 7 SP1 64-bit with Lync 2013 32-bit VDI plugin installed
2. Horizon View Client on Client PC is 64-bit
3. VM is Windows 7 SP1 64-bit with Office 2013 64-bit installed.
Even tried RDP and it doesn't work thru there either. Audio/Video redirection is enabled in RDP too. And yes...I have the latest version of everything...Windows Updates included 