XMPP corporate messenger?

Question

XMPP

I am now looking towards xmpp (the server has not yet been selected), because

• For free
  
• On your iron
  
• Can communicate with other organizations/domains
  
• Have rooms/channels
  

These are the basic requirements, all sorts of goodies, in the form of voice, video, and so on. not critical. I would like to transfer part of the communications from the mail, because at some point it becomes uncomfortable.
However, I did not find a single adequate client for Windows, something in the spirit of slack / hipchat - they are all multi-window and some kind of "old" chtoli, but I want one big modern application.
In principle, both slack and hipchat are liked, but do not satisfy a number of requirements.
Can you recommend some other direction?
upd: If you dwell on xmpp, then I'm still more interested in the client side, namely the application.

Answer 1

Installed OpenFire with Spark client + integration with LDAP(AD) + Asterisk in several organizations . Difficulties usually do not arise. Minus with a database of more than 300 users, you need a machine more serious than an office typewriter. Java.

Answer 2

ejabberd is easy to configure, does not depend on java :)

Answer 3

> but do not meet a number of requirements.
What?
If about selfhosted - that is, lets chat.