Certificates, Security and Identification
One modern problem with email, with web servers and many other areas is how do you prove that you are really you and maintain secure, possibly encrypted, communications.
CACert offer a wide range of certificates, although they are not automatically recognized by Microsoft software - this is due to the large fees Microsoft charge. It is straightforward to load their root certificate (the one that allows them recognition to sign other certificates) into Microsoft software. Again Alex and Megan can assure your identity.