Which flash server i should use for flash chat with a lot of instant users?

I'm currently developing flash chat for social networking websites like facebook. Actually i want to develope flash chat in this game. Chat would have a lot of instant acti开发者_如何学运维ve users. So that, i need to know which flash servers i should use, is there any free ones that are pretty good for such high performance needs?

I've found ElectroServer4 Professional. Is it enough for my task?

Thank you

One free one is Red5 (http://code.google.com/p/red5/) I haven't messed with it in a while but it seemed pretty decent.

I asked a similar question a while ago: Best Flash Audio/Video + Interactivity server?

I ended up going with Wowza Media Server, and have no complaints so far. I had bad luck with Red5, I would not recommend it.