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ISP changes the domain name: The security certificate is assigned for a particular domain name.Time and Date Issue: Sometimes, this error message occurs due to the incorrect date and time of your computer.Invalid Security Certificate: An invalid security certificate between the mail server and the email client is one of the reasons for this error.Some of the main reasons behind this Outlook error are: The security Certificate Error message in Outlook might pop up when MS Outlook can not maintain the connection with an email account. Before discussing the methods of how to fix Outlook Certificate Error, let’s find out the possible reasons behind this issue. You can not access your email account through Microsoft Outlook without eliminating this error.
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The error message appears as: The server you are connected to is using a security certificate that cannot be verified. It mainly occurs when we are trying to connect to an insecure mail server. Normally, it works smoothly but sometimes due to various reasons Outlook security Certificate alerts keep popping up. MS Outlook is one of the most popular email clients that effectively manage all the email activities in the business world.
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