Adding Certificates to the Certificates Store on the Client
Use the following steps to add certificates to the Personal folder in the certificates store on each client computer. The certificates must be added to the Personal folder in the Certificates - Current User store.
Important
If your certificates are not distributed via an enterprise trusted Certification Authority, you must import the Certification Authority's root certificate onto the client computer(s). Otherwise, your personal certificates will not work. Import the Certification Authority's certificate into the Trusted Root Certification Authorities folder in the Certificates (Local Computer) node.
To add certificates to the certificate store
Click Start, and then click Run. Enter mmc, and then click OK.
In the Console1 dialog box, click File, and then click Add/Remove Snap-in.
In the Add/Remove Snap-in dialog box, click Add.
In the Add Standalone Snap-in dialog box, click Certificates, and then click Add.
In the Certificates snap-in dialog box, click My user account, and then click Finish.
In the Add Standalone Snap-in dialog box, click Certificates, and then click Add.
In the Certificates snap-in dialog box, click Computer account, and then click Next.
In the Select Computer dialog box, make sure Local computer is selected, and then click Finish.
In the Add Standalone Snap-in dialog box, click Close.
In the Add/Remove Snap-in dialog box, click OK.
In the Console Root pane of the Console1 dialog box, expand the Certificates - Current User folders.
Under Certificates - Current User, expand Personal.
Right-click Certificates, point to All Tasks, and then click Import.
On the Welcome to the Certificate Import Wizard page, click Next.
On the File to Import page, click Browse.
In the Open dialog box, move to the file location where you have saved your certificate, select All Files for Files of Type, select the certificate that you want to import, and then click Open.
On the File to Import page, click Next.
On the Certificate Store page, verify that Place all certificates in the following store is selected, verify that Personal is displayed in the Certificate Store box, and then click Next.
On the Completing the Certificate Import Wizard page, click Finish.
In the Certificate Import Wizard dialog box indicating a successful import, click OK.
Repeat steps 13 through 20 for all other certificates that you will use in message repair and new submission.