Small Business Server 2008 migrated from Small Business Server 2003. Public folder replication failed during the migration.
Outlook 2007 and OWA can see free/busy information. Autodiscover appears to be working - control-click on the Outlook icon and testing Autodiscover works fine. I'm using a GoDaddy cert and it's definitely properly installed
The appropriate public folders appear to exist, see attached screenshot. The ou=first administrative group folder is empty. Get-mailpublicfolder in EMS yields the attached ZIP file.
I was having problems with Public Folder management complaining that the Name property of the ou=Exchange Administrative Group folder had leading or trailing whitespace, but I fixed that with set-mailpublicfolder in EMS. But I suspect something else is munged.
Starting Outlook 2003 with the /cleanfreebusy switch yields "unable to clean your free/busy information on the server".