An open-source Outlook/Exchange killer. This is the stuff that keeps the Microsoft Office VP up at night.
Wow, open source/free. Business model? Unknown. The UI is ok, but definitely could use a designers touch.
Nice flash demo on their site.
It appears that the system is in Java and is quite feature rich. This makes the project a little disappointing. The system requires a huge 150 meg binary and appears to be large. I would much prefer a PHP app on top of MySQL rather than a huge system. Still, since I don’t know of any PHP apps that come close to giving me GMail style functionality. In the future, when I have some time, I’ll try this out.