Trusted Certifications in Outlook Error

Email Setup
Trust the issuer
Trusting the issuer is as simple as adding the certificate to the Trusted Root Certification Authorities .
To trust the issuer, you need to be able to view the certificate and install it. If the dialog Outlook presents does not include a View Certificate or the certificate does not include an Install button, try logging into OWA from a web browser.
Step 1: View the certificate:

Step 2: Install the certificate:
Step 3: Browse to select the Trusted Root Certification Authorities store:
Moving a certificate
If the certificate is installed on your computer but is not in Trusted Root Certification Authorities, you can move it.
To do this, press Windows key + R to open the Run command, type certmgr.msc then press Enter.
Find the certificate and drag it to the Trusted Root Certification Authorities > Certificates folder.

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