Topic: Status of CentOS 6 support.
I'm working on CentOS 6 support. You can track status here: http://code.google.com/p/iredmail/source/list
All components are working, just need some more testing to make sure they all are working as expected, and it doesn't break support of other distributions.
A beta version of iRedMail will be available soon, please help test when it's available.
It will work with CentOS 6, RHEL 6.x, Scientific Linux 6.x, with both i386 and x86_64 support.
Since it's just a new OS support release, the version number will be iRedMail-0.7.3.