difference between OpenFire and other XMPP servers

Dear All,

I am currently deciding to use between OpenFire and other XMPP servers especially ejabberd. What i like about Openfire is that its java and dont like about ejabberd is that is Erlang.

Anyways, could someone answer a few questions.

1) Is OpenFire under active development?

2) Is Openfire stable in production.

3) How many users can it support. I heard 4500 someplace and someone else said 200,000. which is correct. I would prefer 200,000.

4) Can you list some companies that are using OpenFire.

Thanks

Vinu