We have an Exchange 2010 server. Most users are using Windows / Outlook 2010. We have a few users that use Mac OS 10.8.4 / Outlook 2011 ver 14.3.7.  There are 2 users that when they schedule a meeting cannot see anyone else's free/busy in the scheduling assistant. Both of these users can login to OWA and see free/busy data with no issues. They can also setup their exchange accounts on Windows/Outlook 2010 and see free/busy data with no issues. On both of these users I have un-installed and re-installed, re-created the profile but nothing seems to work. The other Mac users have the same OS version and Outlook version but do not have these issues. Any help would be much appreciated!