Designed to prevent e-mail macro viruses from spreading. It can be used along with or instead of the Microsoft supplied e-mail protection patch. JustBeFriends works will all versions of Outlook and Outlook Express, and is substantially simpler than the Microsoft patch. It makes use of advanced technology developed in part under a DARPA grant titled "Sandboxing Mobile Code Execution Environments". Extensive testing of JustBeFriends was performed by members of the RST Software Risk Management division. Install and uninstall scripting was completed by Core Technologies.