ViPNet OFFICE - VPN
ViPNet OFFICE is an IP VPN and it provides secure client-to-client encryption so that mobile workers, home workers, and remote offices can communicate securely over the Internet with a staff at work directly and central VPN gateway. ViPNet OFFICE is designed as unique client-to-client or... ViPNet OFFICE is an ideal product to create a private network deployed in a public domain nevertheless absolute privacy, security, and manageability to small and medium size networks. ... All ViPNet clients can use ViPNet CryptoExtension plugin for the MS Outlook (or Express) to encrypt and sign e-mails.
http://www.infotecs.biz/demo/office_demo/vipnet_enu.exe - 16Mb - Download - Screenshot