I would like to be able to invite external attendees to a specific domain. It seems that this functionality can only be enabled when enabling the group calendars feature.

However, I would not like for other users in the domain to be able to view anything of another users calendar in the domain . It seems that when group calendaring is enabled, if user A sets up an appointment and he invites user B, then user A can see the availability of user A. I would not like this to happen.

Does anyone know if it possible to give the option to the users of a domain to invite external users for an appointment and at the same time not being able to view the availability of other users in the domain.