Yes they are. Its a ubiquitous Windows 2008r2 AD Solution. There are only around 30 users, so its a small concern.
I was asked (im there Security Consultant) to provide simple daily security advice. I immediately thought yes no problem a simple daily changing logon message ought to do it.
Im well aware of using GPO logon script and message title but its not dynamic enough (and im not there all the time).
I was amazed at the dirth of any such solution that would throw up a simple daily (or even weekly) changing simple security message, that the user would have to dismiss before continuing