Outlook The Security Certificate Was Issued By A Company You Have Not Chosen To Trust [hot]

If you manage an Exchange Server or Office 365 hybrid environment, you can stop these errors for all users:

For home users, the fix is almost always updating Windows or installing a missing root certificate. For business users, the error signals a configuration gap between your mail server’s certificate and Outlook’s expectations. While it is annoying, it exists to protect you from actual man-in-the-middle attacks. If you manage an Exchange Server or Office

If the error mentions a name mismatch, you need to align Outlook’s connection settings with the certificate. If you manage an Exchange Server or Office