How to install the DRS mail server certificate.

Click here to download the certificate.

Click [Open].

Click [Install Certificate...].

Click [Next >].

Select [Place all certificates in the following store], and click [Browse ...].

Select [Trusted Root Certification Authorities], and click [OK].

Click [Next >].

Click [Finish].

Click [Yes].

Click [OK].

Click [OK].

Now, your Outlook will not alert in case of using SSL connection to the DRS mail server until March 31, 2110.