Freebusy doesn't seem to follow bindings.
I have found that querying freebusy information doesn't return the expected information when querying a bound calendar. This was discovered while trying to have a single resource for each office, with binding to each meeting room's calendar and building a script to manage the autoaccepting/declining of the meeting rooms.
My calendar is /ian/home and I have a binding to point /ian/calendar to /ian/home.
If I specifically query freebusy.php/ian/home I get a list of FREEBUSY events, when I specifically query freebusy.php/ian/calendar I don't get any FREEBUSY events.
Generally this would be fine as querying freebusy.php/ian would also get my freebusy information. But as we'd like our 'resources' calendars to be able to be queried as 'resource-office/l5meeting' and 'resource-office/l6meeting' rather than 'l5meeting/calendar' and 'l6meeting/calendar', querying the principal rather than the calendar won't work.
We'd like to see the freebusy information returned when directly querying a calendar binding.