Hello I have a question. I am trying to get Free / Busy to work on Exchange 2013. There are currently no other Exchange servers in my environment. The clients are using Outlook 2007.

Does anyone know how to get the Free / Busy working with Exchange 2013 and Outlook 2007?

You do have Outlook 2007 patched to SP3 and the most recent update?

http://blogs.technet.com/b/rmilne/archive/2013/07/18/patching-exchange-don-t-overlook-outlook.aspx

Hi, yes I do have SP3 on my machines and when I try to give someone permission to the mailbox I keep gettig this error

Error while preparing to send shared message.

I should say that when we had 2003 it worked fine. We then migrated to 2013 and free busy stopped working. We no longer have any Exchange machines except for 2013. 

We didn't / don't use public folders so I never transferred those over.  I'm not sure if that would cause any issues.