I need help in installing LCS/OCS in ubuntu

Hi,
I need help in installing LCS/OCS in Ubuntu which contains firewall (ISA). I have tried installing using two options.
The first one was by downloading it from Sourceforge and then installing it.
The second method was through “sudo apt-get install pidgin-sipe”. The installation goes on well without any problems, but I’m unable to create the accounts after I launch the application.
I could not find the “Microsoft LCS OCS” in protocol list.
Please help me.
