[Dovecot] o/s tuning for imap

[Ken A]

I'm switching from a pop3 only dovecot install to a pop3/imap install 
and I'm wondering how many connections every 100 'normal' imap users 
might have/keep open? I'm wondering if I need to tweak any o/s related 
things, like time_wait, etc. Any pointers would be greatly appreciated.

Thanks,
Ken A.