Export a certificate from Windows 7 / Server 2008
I copied this from MS TechNet . Applies To: Windows 7, Windows Server 2008 R2 You can export a certificate in order to import a copy on a different computer or device or to store a copy in a secure location. If you are exporting certificates for import onto a computer running Windows, PKCS #7 format is the preferred export format. This format preserves the chain of certification authorities (CAs), or the certification path, of any certificate that includes countersignatures associated with signatures. If you are exporting certificates for import onto a computer running another operating system, it is possible that the PKCS #7 format is supported. If it is not supported, the DER-encoded binary format or the Base64-encoded format is provided for interoperability. Users or local Administrators is the minimum group membership required to complete this procedure. Review the details in "Additional considerations" in this topic. To export a certificate...