Interesting fact about the Opensolaris development cycle - revisited

Alan Burlison wrote in a comment to the Opensolaris development cycle article:

Just to be clear, all the servers run opensolaris, it's just that build 45 is the oldest build we run, we are running a number of newer releases as well. And we are making use of Solaris features such as ZFS, Zones and Live Upgrade as well - plus we are just starting to move over to ZFS root.

Just too good to hide it in the comment sections.