Bjoeboo,
I think you'll find KevinH is very much still at Zimbra - he's one of the lead engineers (sorry if I'm under valuing you here Kevin

, and also one of the forum admins.
It may have taken a while as Ubuntu isn't necesseraly the distro that most paying customers are using. I think you'll find that RHEL is the leader there, and as those customers keep Zimbra ticking that's where the bulk of development work goes. Remember Zimbra is a business and as such aims to make money.
(HELPFUL HINT)
Try and be a bit more constructive with your critisism and complaints please, this way people will be more receptive and try and help you out more. Going guns blazing tends to alienate you from the rest of the community.