[Error Code] FreeBusy gsync32!FreeBusyServer:: ValidateOutlookFreeBusy Config [Explanation] 
The logs indicate that Free/Busy functionality will not work due to local settings. To correct this, under the registry key HKLM\SOFTWARE\Microsoft\Office\12.0\Outlook\ SchedulingInformation\FreeBusySupport set the value of 'SMTP' to '{0006F049-0000-0000-C000-000000000046}' (without quotes). Currently it is set to '(null)'.