When users trying to set up out of office in outlook 2013 (exchange 2007), they get error message "your automatic reply settings cannot be displayed because the server is currently unavailable. Try again later.".
The weird part is that on some machines the issue was resolved by entering Exchange server DNS name in the Proxy exceptions (Internet Options) as we have proxy, and disabling IP V6 solved the issue on other machines. However; we still have at least 50% that machines that get the same error.