Making a backup copy of the certificate.Using Outlook to exchange certificates with others.
Using Internet Explorer to install the certificate.Using Outlook to download the certificate.Using Internet Explorer to apply for a certificate from Comodo.Always use the same browser for requesting and installing the certificate, otherwise you will very likely encounter an error. The instructions below use Internet Explorer and Outlook as the basis for installing, backing up and using digital certificates.
The file that holds the backup can then be used to import the certificate to another computer or to the same computer if the certificate is lost either by a system upgrade or mishap. We recommend also that you make a backup copy of your certificate once it has been installed. Firefox uses its own keystore and this will not be accessible to other applications. We recommend - if you use Microsoft Windows - that you use Internet Explorer as your browser for this, because it installs the key pair in the Windows Registry. Remember that the certificates can only be used on the computer on which they're installed they cannot be used with your email account when accessed from another computer unless you make a backup copy and import them to the other computer. You can find out more about these on Wikipedia. When you apply for a certificate, a key pair consisting of a public key and a private key are installed on your computer, via your web browser. The following instructions describe the use of free certificates, obtained from Comodo. You can either purchase certificates to last for as long as you need them, or you can obtain free certificates which last for one year. In order to share secure, confidential or encrypted email with another person, your computer needs to have digital certificates installed. If you want to install a digital certificate on an Apple Mac rather than a Windows PC, please see FAQ 2537. 2388Installing digital certificates for secure email (for Windows PCs and Outlook)