Calls the get_free_busy_sync method on the given backend.
| this |
An ECalBackendSync object. |
| cal |
An EDataCal object. |
| cancellable |
a Cancellable for the operation |
| users |
List of users to get F/B info from. |
| start |
Time range start. |
| end |
Time range end. |
| freebusyobjects |
Placeholder for F/B information. |