I really like Zimbra, but have run into a similar issue. I am trying to migrate our company off Exchange for cost reasons, and was hoping to use zimbra. However, group calendar and group contacts are a
must for the users in the company... and unfortunately they do not seem willing to give up their precious Outlook. I did find that Scalix offers this for under 25 users for free.. any more, and you have to pay for their Enterprise version. Maybe this will help you. I on the other hand.. am going to attempt to get everyone off Outlook (since that will save more money as well) and get people here used to the web interface. I would be open to a per license price on the outlook connector as well, but if the boss people don't budge.. I am probably going to have to go with Scalix... which is closed source... not as feature rich... and definately not as pretty.
