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OoO not working because AutoDiscover does not work
1 First: Always check Certificates and DNS 1.1 Check if your certificates are configured correctly and if they have expired. Open the Exchange Management Console and run: Get-ExchangeCertificate | fl Review your certificates and ensure that they have not expired 1.2 Check DNS A good way to test DNS is using NSLOOKUP. Open cmd and type nslookup and hit enter. (In our case we need to run nslookup to our client’s autodiscover address to test redirection as we user autodiscover redirect.) Type autodiscover.yourdomain.com (or .net etc.) this should return with the redirect address as per below screenshot. …