The 3.5.0.0 version of SecureMessenger is available as a free download on our website. The actual developer of the free software is AntraSoft. The program lies within Communication Tools, more precisely Instant messaging.
From the developer:
AntraSOFT Secure Messenger is a stand alone email program which provides end-to-end security for highly confidential information communicated via electronic mail using security public & private 1024-bit key (security certificate) and POP3/SMTP protocol.
You may want to check out more software, such as MSN Messenger Khalid Edition, South Park Theme Pack for Messenger or Mnemic Emoticon Packs for Messenger, which might be similar to SecureMessenger.