To be able to sign documents electronically or send signed or encrypted e-mails, you must first import your personal user certificate into the Windows certificate store.

To do so, please search fo the certificate file on your computer and execute it with a double mouse click:

This will launch the Certificate Import Wizard:

In the next step, you are to choose a certificate file. In your case, the file has already been chosen:

Next, enter the password you have set when creating the .p12 file.

Choose import options:

• If you select "strong private protection", you will have to enter the above password every single time you send a digitally signed e-mail.
• Choose "Mark key as exportable" to be able to generate a .p12 file from the Windows certificate store.
  • It is optional, but useful if you save your .p12 file in the Windows certificate store only.

Choose a certificate store:

Click "Finish" to start the certificate import:

Click OK to complete the procedure: