Outlook linked to the Client Access Server it established
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At the time Outlook linked to the Client Access Server it established whether it is an in-house or an outside link. You can see in the attached image?
X2007srv.labs.local
Information you exchange with this site cannot be viewed or changed by other. However, there is a problem with the site's security certificate.
The security certificate is from a trusted certifying authority.
The security certificate date is valid.
The name on the security certificate is invalid or does not match the name of the site.
Do you want to proceed?
Yes    No    View Certificate
I am not sure why this happens. Will somebody help me?