I also forgot to mention Yahoo! who bought Zimbra, which pretty much covers what you just mentioned through and through. Also see: http://alternativeto.net/sof

I also forgot to mention Yahoo! who bought Zimbra, which pretty much covers what you just mentioned through and through. Also see: http://alternativeto.net/software/microsoft-exchange-server/ http://alternativeto.net/software/microsoft-exchange-server/