I'm really glad to be part of this community. It's one of the best communities that i ever had.
We have here one total of 3500 mailboxes with an average of 25000 emails per day, using the version 5.0.6 FOSS edition.
The server have this configuration:
Intel(R) Quad Xeon(R) CPU 5120 @ 1.86GHz
16GB RAM, 4MB of cache, turned on in a storage by fiber channel for /opt/zimbra.
I just want to know if we can use the instant messenger and restrict to some users in Zimbra (without network rules). We will use a jabber client (Pandion for Windows).