We are running Exchange 2013 in a period of co-existence with Exchange 2007. This issue just started recently and does not happen consistently. When you add users to scheduling assistant you often get "No Information" very randomly.
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But if you uncheck and re-check "Send this Meeting to this Attendee" or remove/add the user several times, then the Free/Busy Information will populate again.
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Originally I suspected this is an Outlook issue, but strangely it is happening within OWA as well. So this is most likely a server issue.
