Jon

Thanks for the update on Zimbra 5.05. I just wanted to
add that any costs comparison naturally favors Exchange
since the costs for Exchange remains the same
throughout the 3 or 5 year comparison period.

That's not quite fair considering Exchange's greater
complexity, higher server requirements, less efficient file
system which needs optimization every so often, yearly
AV/Anti-spam server licenses you have to fork out for
since AV/Anti-spam is not integrated compared with
Zimbra and Scalix. For users who have a mixture of
Outlook clients and just Web clients, they will realize
further savings in not having to purchase Outlook client
licenses as well.

So for me, I would take a closer look at Zimbra vs Scalix
and it's a toss up depending on your preferences.