Even the remote access functionality is doomed by feature interaction. To ensure that all messages are delivered in a reasonable time on a network where machines might appear and disappear at random (when they are turned on and off), AOCE has a 15-minute timeout in which it repeatedly tries to deliver pending messages. If the user is using a dialup connection on a modem, AOCE keeps the line open for a full 15 minutes before giving up on disconnected user, driving up long distance bills to deliver a potentially tiny message.