If Exchange 2010 free/busy info isn't working, the first thing you should check is the Autodiscover service.
If you work with external users or partners, you'll need an entry in your public domain name server (DNS) zones to check Autodiscover. The Autodiscover service is found by Outlook clients when querying the service connection point (SCP) object in Active Directory.
No matter which you use, make certain that the URL defined for EWS is accessible.
The EWS URL settings are only manageable through the Exchange Management Shell.
The SCP is set up when the CAS server role is installed, but you should still validate that it is working correctly.
Each CAS service URL has two properties: internal and external.
My problem is that when I go create a new appointment in Outlook and go the Scheduling Assistant, the free/busy information for other people and rooms does not show. No free/busy information could be retrieved.' and 'Your server location could not be determined.
So, you need to check on dns resolution for the local PC and access to autodiscover.or whatever.
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