M$ Office Communicator on Linux

Use pidgin plugin for logon to Microsoft Office Communicator. This is for ubuntu.

# sudo apt-get install pkg-config libglib2.0-dev libgtk2.0-dev pidgin-dev libpurple-dev libtool intltool comerr-dev 

Get plugin from  http://sourceforge.net/projects/sipe/

# tar -xjvf pidgin-sipe*.tar.gz
# cd pidgin-sipe*
# ./configure --prefix=/usr
# make
# sudo make install 

Now you can find M$ Office Communicator in Pidgin.