Is anyone willing to divulge what the going rate for Zimbra licensing?
Perhaps the OP is experiencing the same problem I have. I have been unable to get any information from Zimbra as to their prices/licensing/etc... While they list a phone number to call for sales on the Buy Zimbra link bill referenced, it has not been answered and there is not even an opportunity to leave a voice mail, any of the times I have called it in the last couple of weeks.
Production: 5.0.18_GA_3011.UBUNTU8 FOSS Ubuntu 8.04 LTS
Tested: 7.1.4_GA_2555.UBUNTU10_64 NETWORK edition Ubuntu 10.04.4 LTS
Left Zimbra for a different product in 2011, thinking about coming back.