I'm really surprised there is no mention of SOGo (http://www.sogo.nu/ http://www.sogo.nu/). It has a nice mail interface plus calendaring and even provides mob

I'm really surprised there is no mention of SOGo (http://www.sogo.nu/ http://www.sogo.nu/). It has a nice mail interface plus calendaring and even provides mobile device integration via an Exchange compatible interface (so your mobile device calendar and email integrates using the Exchange connector). I've never understood why it does not get more traction (or mention on HN).