So I have a small group that would need a self hosted Im/voip and possibly video conferencing solution. My goal is for a small group of people (no more than 40) to be able to collaborate within a local area network. I need something that is self hosted, so unfortunately outside solutions like Skype and hosted Lync would not work. I'm looking for something that would allow both one on one, and group communication, so and IRC server would not work.

I'm hopefully looking for something that does not require multiple servers, or is too complex to set up. As a student, I have a license of Lync 2013, but setting that up on a single server without active directory is practically impossible.

Would Lync 2010 be easier to do on a single server? Are there any other good solutions?

Thanks