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The Outlook certificate helps keep the email secure. Essentially, it's a digital certificate for signing into an email so that the receiver can be assured that the upcoming mail is from a known and valid person. However, people also report facing the Outlook certificate error . They complain of receiving popup of Outlook certificates repeatedly. You must know how to resolve this issue. Otherwise, it will become a source of major inconvenience. In this article, you'll understand the various causes and fixes for the certificate error.   Why does Outlook Certificate Error Arise? There are majorly four reasons for this error. They include the following. A wrong certificate is a significant reason for this error. Incorrect date and time settings on your machine can also result in a certificate error. If the system's date goes beyond the expiry date of the certificate, this issue will inevitably come up. Change of the domain of the internet service provider. If your ISP changes t...

Although Outlook is a great email service, its users also encounter various errors at different points of its usage. Its security error occurs when the user tries to link to an insecure email server. A message shows the Outlook error the server you are linked to is utilizing a security certificate that can't be verified. In this article, you'll get to know the reasons behind the Outlook certificate error and ways by which you can fix it.   Why Does the Outlook Certificate Error Occur? This error can come up due to numerous reasons. They are given below. The major reason for it is the invalid security certificate. It's important for the mail server to have a valid security certificate. Wrong time and date can also lead to this error in Outlook. If the date is wrong and goes beyond the certificate's validity, MS Outlook will show this error message. Each server has a specific certificate that's assigned to its domain name. Using the old domain name can cause you to e...