This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
I wouldn't think that OS permissions have much to do with renaming a mail directory. Could be, I guess, but a mail server based on file system storage creates, renames and deletes files all the time, so it needs those permissions to function.