As computer-mediated communication becomes increasingly prevalent in the workplace, students need to apply effective writing principles to today's technologies. Email, in particular, requires interns and new hires to manage incoming messages, use an appropriate tone, and craft clear, concise messages. In addition, with instant messaging (IM) making its way into corporate communication, students are further challenged to transition from IM with friends to IM with professional colleagues. Business communication courses at Cornell University are an ideal place for students to learn and practice new ways to write for these technologies. While instructors can teach basic principles by having students compose and analyze emails, these methods lack the organizational context and real-world pressures of handling volume correspondence at work. A technology-based simulation allows students to test their writing skills within a realistic, real-time environment, within which they make decisions about whether and how to respond to messages based on organizational culture, the sender's position relative to their own, and the urgency and relevance of a message. This article describes a simulation which the author developed for undergraduates. The simulation--set at Writeaway Hotels, a fictitious organization--is facilitated in a computer lab, with students sitting at individual monitors. During the 30-minute session, students prioritize, respond to, and evaluate incoming email. From this experience, students learn how to analyze messages and make important communication decisions regarding response time, channel choice, and tone.