Exchange 2010 Free/Busy and Automatic Reply problems

One Exchange 2010 SP2.  Clients use Outlook 2010.  Windows XP and Windows 7.
Some clients are having an issue with the Free/Busy and with the Automatic Replies.  Problem clients are not on the same database.  Exchange has been in place for 2 years. Clients had previously used the Free/busy and automatic reply without issue.

Free/Busy  error: No Information, No Free/Busy information could be retrieved, Your server location could not be determined.
Automatic Reply error: Your automatic reply settings cannot be displayed because the server is currently unavailable. Try again later.

Seems like it might be the autodiscover, but am not sure.
mvitdeptAsked:
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abdulalikhanCommented:
The free busy information is handled by EWS (Exchange web services) virtual directory. Check if the settings are correct. Can only be modified using Exchange Management Shell.

Autodiscover directories should also be correct.
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mvitdeptAuthor Commented:
How do I check the settings?  Free/busy had been working for everyone previously.
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