If you continue, the information that you view and send will be encrypted, but will not be secure.
When you receive this warning message, you can click Continue to accept the warning. However, the warning may reappear the next time that Autodiscover runs.
Method 1Reissue a certificate that includes the domain name as the Subject Alternative Name. This enables you to resolve the issue for all Outlook for Mac clients without having to trust the certificate from each client individually.
Method 2Trust the certificate on the Mac client. This solution enables you to resolve the issue quickly for individual Mac clients without having to reissue the certificate.
- When you receive the certificate warning message, click Show Certificate.
- Select the Always trust <https://www.domain.com> when connecting to <domain.com> check box, and then click Continue.
When you view the details of the certificate by clicking Show Certificate, you see a warning message in the certificate details that states the following:
If you receive a certificate warning that resembles this warning but does not contain the phrase "host name mismatch," method 1 in the "Resolution" section may not resolve the issue.
For more information about how the Autodiscover service works with Outlook for Mac, see the following Microsoft TechNet article:
Article ID: 3066652 - Last Review: Aug 14, 2015 - Revision: 1