rpath's conary and solaris... On the established OS scene a porting to Solaring (both x86 and SPARC) would be a good fit.
On the bleeding edge, bet on the future, i 'd sugest a port to rpath's Conary, the new venture started by Erik Troan, of RH' rpm fame, and AFAIK the linux packaging technology to follow atm. The appliance model beeing advocated by conary seems a very good fit to zimbra. More, it would simplify a lot installation, and future upgrades... [Since Zimbra announced an Asterik partnership with digium, just ask them why are they interestes in conary based asterik 'appliances']
My .2 €uros
Best regards, and keep the damn good work
António |