Freebusy information is stored in the FREEBUSY directory, so you can check for existence of the entries by doing something like an
The actual freebusy data will be encoded in binary, but you should be able to see if something is there.
you can use ommodu (check man page for details) to remove and add entries to this directory.
The actual data publish will be done by outlook and/or swa, so if you recreate the entry in the directory, you will still need to start any of the clients, add a new calendar appointment (which will trigger the resync) and then exit the client (outlook publishes triggered by time and on-exit).
If the information is actually published in the directory, one other thing to check is mailnode mapping (omshowmnmp should show correct mappings between mailnodes and fully-qualified hostnames), in particular in a multi-server environment where remote free/busy data will be accessed through the Directory Relay Service - which must be running as well.
Hope this helps,
Florian.