Thanks for the help.
We are indeed a small organization (NGO) in the heart of Africa (Burundi) trying to implement internal IM to overcome the ever failing internet connections. When the internet connection goes down we just want to continue communicating and sharing files in a very easy manner. There is hardly any local IT capacity available.
We are running a very tiny and very basic local network. The server (1) running NT4 and the client machines XP (20). The server is only used for the internet connection and we are trying to install a central virus control.
I have just been asked to assist them a bit on a volunteering basis, but I am totally not a windows expert (linux is my thing).
In spite of this information I agree with LG that this question is out of scope of this forum. If you like to assist us a bit more you are more than welcome, but let’'s do it outside the forum. My email address victor[at]eacoss[dot]org