I need to make a decision on whether to pull the trigger and purchase one of the ZCS Network Editions or to purchase a separate hosted exchange solution for our power users and keep the majority of staff on ZCS open source edition.
We currently use Zimbra Open Source for around 50 employees. I am considering purchasing the Starter Network Edition,even though its additional features will be used by, at most, five people. If I purchase either the Starter Network Ed. or the full Network Ed., will it still support unlimited users for the Web-only interface are will we be limited to 25 users?
One other concern is that I use Taglocity with Outlook. AFAIK, Zimbra does not support unlimited tags/categories. Therefore, my Outlook categories would not be synchronized among multiple devices. This seems to be the only Outlook feature I use that is not supported by Zimbra based on my tests of uploading PST files to Zimbra. But it is probably a deal killer given the importance of categories/tags to my work flow.
One final question: if I purchase a hosted solution of ZCS for a limited number of users, can they link to calendars and tasks from another ZCS domain? For example, say Company A has ZCS and Company B has ZCS. Can an employee as Company A share a Zimbra calendar with an employee at Company B even though they are on different ZCS servers and different domains?