At the time Outlook links to the Client Access Server it established whether it is an in-house or an outside link. You can see on the attached image?
I am not sure why this happens. Will somebody help me?
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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
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Outlook security alert pop up
Hello!
You are getting security alerts when you open Outlook even though you have the licenses. You need at least two certificates; one of OWE/Outlook anywhere and another one is for auto-discover.
You need to request for another certificate for SSL. When you open the SSL certificate and it is not working, you will get a security warning. You also need to check this link for this issue.
On the other hand, you need to check your Outlook security option.
You need to go Tools menu, then Option, then Email option and then finally desktop alert setting.
Here is an image for as a guide.
Hope it will help you, If you need more help on other issues, just visit this site again.
Have a good day.