The /usr/lib/cyrus-imapd/idled program (which is needed for proper IMAP IDLE support) is missing. The documentation refers to idled, the manpage for idled is there, and /etc/cyrus.conf has a (commented out) entry for starting idled, but the binary itself is absent. Version-Release number of selected component: cyrus-imapd-2.2.10-3.fc3
Here is why I don't enable idled in the Invoca rpms, which the RedHat packages are derived from: http://asg.web.cmu.edu/archive/message.php?mailbox=archive.info-cyrus&msg=19209
So, if you compile idled and don't use it you get noise in the logs. Fair enough, but I'd add that apart from outlook, mozilla/thunderbird now supports IDLE, as does the gnome mail-notification applet. Proper IDLE support is nice, because you get instant notification of mail arriving, and polling is pretty dumb if you can avoid it. If you don't compile with idle, then I think it is a bug to install the manual page and refer to it in the config file.
It's fixed in the current Invoca rpm now. Which means no idled related files are installed until you build the binary rpms with the idled option enabled. The commented out line in cyrus.conf will stay there because it's the distributed config from the cyrus-imapd package. However I'll not include idled support in the default config until some really large sites with very mixed client environment confirm that it works without any problems.
The current Invoca rpm 2.2.10-10 now enables IDLED support by default. I didn't get any negative report so far so I expect things to works quite well and I'm quite sure it will also show up in the next RedHat release.
This will show up in the next fedora release, FC4