Now, also inexperienced users can start using S/MIME out-of-the-box. The configuration of X.509 root certificates is made simple by Gpg4win. Gpg4win supports both: OpenPGP and S/MIME (X.509) Gpg4win is an installer for Windows and contains several Free Software components:
Gpg4win and the software included with Gpg4win are Free Software (Open Source among other things free of charge for all commercial and non-commercial purposes). It is maintained by the developers of GnuPG.
Gpg4win supports both relevant cryptography standards, OpenPGP and S/MIME (X.509), and is the official GnuPG distribution for Windows. Digital signatures make sure that it was not modified and comes from a specific sender.
