Seriously, it's not that hard to install and setup.
Once you have it all going the capabilities are immense. It also lives on your machine, using your SSL certs, and using as much in-place HDD encryption as you want.
This is how you take your privacy back. You care enough about it to do it yourself.
It's also how you give yourself a headache having to sysadmin a machine. I myself used to run Zimbra and switched to Google Apps. Too much irritation with backups, monitoring, security, et al.
Seriously, it's not that hard to install and setup.
Once you have it all going the capabilities are immense. It also lives on your machine, using your SSL certs, and using as much in-place HDD encryption as you want.
This is how you take your privacy back. You care enough about it to do it yourself.