here is a link for helpful articles
http://www.proexchange.be/blogs/exchange2007/archive/2009/07/14/your-out-of-office-settings-cannot-be-displayed-because-the-server-is-currently-unavailable-try-again-later.aspx
and a articales about autodiscover
http://www.exchangeninjas.com/AvailabilityServiceFAQ
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