I am doing a migration from Exchange 2003 - 2007, I've tested free busy over and over from every concievable client and server setting I could think of. Everything appears to be working, if I use the /cleanfreebusy switch then add users to a meeting I can view their availability.
However when I go to send/recieve and look at "free/busy" it appears grayed out. Now it appears to be working aside from manually downloading the free busy. Not really sure how to go about troubleshooting this since free/busy appears to be working.