we detected a bad behaviour in our test environment (OCS EE Expanded Edition) on our Outlook 2003 SP3 Machines.
We configured the permission to invite anonymous participants on a per user basis.
Every client software piece has the current software release. (OC 6.0.6362.64, Live Meeting 8.06362.70, and Conferencing Add-In 8.0.6362.70).
On Outlook 2007 machines user are not able to create an anonymous LM invitation with the halp of the conferencing add-in if they are not allowed to. That's OK and that's the behaviour we want.
On Outlook 2003 SP3 Machines the same user accounts can reproducible create anonymous invitations and send them out. That's the behaviour we don't want. They get a warning that this is forbidden (if it has been switched to anonymous at the moment you click on the conferencing add-in planning button) but they are able to switch manually to anonymous and send the inivtation out.