Hi, we're looking at using Zimbra Notebooks as a replacement for Twiki. First thing I needed was to get my head around the "sharing a notebook" concept. I quickly realized that I could reproduce my existing Twiki "Web" concept by having users and groups and a central administrator account that managed and owned the Notebooks that had previously been "Webs". That takes care of my permissions issues (I think), and gets around my initial fear that Notebooks were user-based and user-created only and there'd be no easy way to give large amounts of users access to each Notebook.
At any rate, the only thing I think I'm missing is maybe some sort of email notification when a page in a notebook or a notebook itself is updated. Any ideas?
(Also, any thoughts from other experienced Twiki migrators are appreciated too!)