All users are responsible for the integrity of their data. No user shall ever open any files or macros attached to an email from an unknown, suspicious, or untrustworthy source. Users shall delete such attachments immediately and then "double delete" them by emptying the trash. Users shall delete spam, chain, and other junk email without forwarding and they shall never download files from unknown or suspicious sources. Users shall never share any files or folders from their local drives. Users must not disable or alter the installed anti-virus software.