Method One
Start the Certificates, Current User snap-in, and then double-click the Personal folder.
Double-click the Certificates folder. A list is displayed that indicates the certificates that are stored in the user's store.
Click the certificate for Secure Sockets Layer (SSL) communication, and then click Export . A wizard is displayed that enables you to export the certificate.
Method Two
If you are running Internet Explorer 5.0 or later, follow these steps:
On the Tools menu, click Internet Options .
Click Content , click Certificates , and then click the Personal tab.
Click the certificate that is used for SSL communications, and then click the Export button. A wizard is displayed that enables you to export the certificate.
When you come to the end of the wizard, save the certificate to a public folder in Binary or Base64 format so that it can be mapped to the Active Directory user account.
NOTE : For SSL purposes, the certificate should at least support client authentication.
Start the Active Directory Users and Computers snap-in, right-click your domain, and then click Advanced Options on the View menu.
Open the Users container or the organizational unit where the user accountresides, right-click the user account, and then click Name Mapping .
Click Add to link the user's certificate to the Active Directory user account.
Click the public folder where the user certificate was saved, click the user's certificate, and then click Open .
Click to select the Use Subject for alternate security identity check box.
Click OK to accept the mapped certificate.
Click OK to close the Identity Mapping dialog box.