I think the issue some people have with email is they use their email client for things it wasn't designed to do. For instance a todo list or for reminders etc
I don't know much about this project in particular but wouldn't the ability to have a web based client instead of a desktop app like Thunderbird or Outlook be useful? The ability to see all my mail from the browser on my many devices could be good.
Not yet. It is rough right now as I only use it myself. I would need to clean it up a bit if it were to see the light of day. If I get enough interest I would be willing to do that.
If you have an faq with more than a few entries this product will make it much easier to browse and search. The search handles stemming and synonyms to help users find what they are looking for. It is also a content management system so it is easy to add/edit/delete without touching html or your website.
On the administration side it also has interesting analytics to show what people are searching on, what categories they browse and what answers they look at.